What’s a good marathon time by age? (and what’s realistic after 40)

You finished the marathon, you’ve got the medal in a drawer somewhere, and the question won’t leave you alone: was that actually any good?

You find yourself comparing your time to the runner you know from the club, to the bloke at work who did London, to whatever number a half-remembered article once told you “good” looked like. And underneath it all sit the questions you don’t quite say out loud: Is this as good as it gets, now that I’m the age I am? What’s a good marathon time by age?

Here’s the short answer. For most recreational runners, a good marathon time lands somewhere between four hours and four-thirty. But age changes that answer significantly, and it should. A 4:15 marathon run by a 52-year-old is a far more impressive piece of running than the same time run by a 28-year-old, even though the clock reads identically. “Good” is not one number. It depends on how old you are, whether you’re a man or a woman, and – the part most articles skip – how much of your training you’re actually getting right.

This article gives you the real figures by age and gender, explains why your age genuinely does change the target, and then makes a case you might not expect: for most midlife runners, the gap between your time and a “good” time is far more about training than it is about age.

What counts as a good marathon time at any age?

Before we break it down by age, it’s worth being honest about a word that gets thrown around carelessly. “Good” gets used to mean at least three different things, and they are not the same race.

The first is faster than average. Across the most comprehensive recent data – RunRepeat’s State of US Marathons 2025 report, produced in collaboration with World Athletics and covering around 97% of US marathon results – the median finish time is 4:25:33. Men come in at a median of 4:10, women at 4:38. Beat those and you are, quite literally, an above-average marathoner. 

The second meaning is competitive for your age group. This is where age grading comes in, and it’s the fairest way for a midlife runner to measure themselves. Rather than comparing your raw time to a field full of runners in their physical prime, age grading expresses your time as a percentage of the world-best for your exact age and sex. A score around 60% is a solid club runner, 70% is genuinely strong, and 80% is approaching national class for your age. It’s the single most useful number a runner over 40 can know about themselves.

The third meaning is qualifying for something: a Good For Age place at London, or a Boston Qualifier. These are hard standards, sitting at roughly the top 10–15% of finishers in each age group, and they’re a different conversation from “above average”. For most runners chasing London, the GFA standard is the floor, not the target.

For context on just how select the sharp end is: only around 4% of male finishers and 1% of female finishers ever break three hours. So before you’re hard on yourself about a four-hour-something marathon, remember the company you’re already in.

A good marathon time by age (the numbers)

Here’s the part you came for. The table below blends three sources: median finish times from RunRepeat’s 2025 dataset (the “average” column), benchmarking percentile data for five-year age bands from published marathon distributions (the “good” column, roughly the 25th percentile, faster than three-quarters of your age group), and Boston/GFA-style standards as the “competitive” marker.

A note on honesty, because it matters to us: the largest single dataset (RunRepeat) reports in ten-year age bands. The five-year breakdown below draws on benchmarking data calibrated to published marathon distributions and age-grading literature rather than one single race, so treat the five-year figures as well-grounded directional ranges, not stopwatch-precise cut-offs.

Marathon finish times by age: men

Marathon finish times by age: women

One pattern worth noticing in the data: the slowdown through your forties is real but gentle. It’s only after about 60 that the curve starts to steepen. The decade most midlife runners panic about – the forties – is the one where good training makes the biggest difference to where you land.

What’s a good marathon time for a 45-year-old?

Since this is the question more midlife runners ask than any other, let’s answer it head-on.

For a 45-year-old man, the average marathon time sits around 4:30. A genuinely good time – faster than roughly three-quarters of your age group – is in the region of 3:45. Dip under 3:02 and you’re into competitive, Good-For-Age territory.

For a 45-year-old woman, the average is around 4:55. A good time is approximately 4:15, and sub-3:46 puts you in the competitive bracket, knocking on the door of a London GFA place.

The same logic shifts only slightly either side of that age. At 40, the bar is a little quicker – a good time for a man is nearer 3:35, for a woman around 4:05. At 50, it eases – roughly 3:55 for a man and 4:25 for a woman marks you out as a strong runner for your age. 

But raw numbers only tell you where you stand today. They tell you nothing about where you could stand. For that, you have to understand what age is actually doing to your running – and what it isn’t.

Why your age changes what “good” means

Some of the slowdown that comes with age is real, measurable, and not up for negotiation. Your VO2 max – the engine size that determines how much oxygen you can use, declines by roughly 7 to 10% per decade after 35. Your maximum heart rate drifts down by about one beat per year. And your body takes longer to recover between hard sessions, which quietly limits how much quality training you can absorb. Add the gradual loss of muscle from your forties onwards, and you have the physiological reasons the table above slopes the way it does.

This is the point where it helps to hear from someone who has coached hundreds of runners through exactly this transition. Mike Gratton won the London Marathon in 1983 and has spent the decades since coaching runners of every age and ability.

“I’ve coached enough runners through their forties and fifties to know the pattern. They feel slower, so they assume it’s the years catching up. But when I look at what’s actually changed in their training, the answer is nearly always there in black and white. Genuine age-related decline is gradual and gentle. What people mistake for it is usually just training that’s fallen away.”

Mike Gratton, Head Coach and London Marathon Winner

That distinction between true ageing and accumulated detraining is the most important thing a midlife runner can understand. Because one of them, you can do almost nothing about. The other you can fix.

Are you actually slowing down, or just undertrained?

Here is the uncomfortable, liberating truth at the heart of this whole article. Most midlife runners are nowhere near the limit that their age imposes. They are bumping up against the limit their training imposes, and then blaming it on getting older.

Think about what changes between 30 and 50 for the average runner, and notice how little of it is biological. The weekly mileage drifts down as work and family expand. The structured speed work – the intervals, the tempo runs, the sessions that actually hurt – quietly falls away, because they’re hard to fit in and harder to motivate yourself for. Long runs get shorter or less frequent. Strength training, which protects against exactly the muscle loss that ages a runner, never makes it into the week at all. None of that is your VO2 max declining. All of it is training declining.

The research backs this up plainly. The same studies that measure age-related decline also show that runners who hold their training volume and intensity steady into their forties and fifties slow at roughly half the rate of those who don’t. Trained masters runners cut the typical decline in half. Half of the slowdown you fear is optional.

“I see it again and again: a runner hits 45, commits to proper training for the first time in their life, and runs straight past the personal best they set at 35. At 35, they weren’t training hard; they were just young and getting away with it. Train properly in your forties, and you’ll often discover the runner you could have been all along.” Mike Gratton, Head Coach and London Marathon Winner

This is not false reassurance. The physiological ceiling is real, and it does lower with age. But the overwhelming majority of midlife runners never get anywhere near their current ceiling, because they’ve never strung together a genuinely well-structured block of training. The number in the table is not your destiny. It’s a snapshot of a field, most of whom are training no better than you are.

What this means for your training

So what do you do with all this?

First, stop comparing your raw time to runners half your age, and start using age grading. Run your most recent finish time through an age-grading calculator, and you’ll get a percentage that tells you, honestly and fairly, how good your running really is for your age and sex. A 50-year-old running 4:15 may be a “better” runner, in age-graded terms, than a 30-year-old running 3:45. That single number reframes everything, and it’s a far healthier target to chase than a time that belonged to your younger self.

Second, set your goal from where you could be, not where the average sits. If your age-graded score is sitting at 50%, that’s not a verdict on your potential – it’s a signal of how much room you have. The runners who improve most in midlife are almost always the ones who discover they were never really training hard in the first place.

Third, train the things that actually move the needle for a midlife body: consistent weekly mileage rather than heroic one-off long runs, genuine speed work done at the right intensity, strength training to hold off muscle loss, and – this is the one midlife runners ignore most – real recovery between hard sessions, because your tolerance for back-to-back hard days is the thing that changes most with age. Getting your training zones right matters more than ever here; if you’re guessing your effort levels, our heart rate training zones guide will help you anchor them properly.

This is exactly the approach Mike built the Run Your Best Race coaching programme around – structured, individual, and designed for runners fitting serious training around real midlife lives, not around a 20-year-old’s schedule.

A number is not a ceiling

I ran my first marathon in Paris back in 2012. I was 29 years old and finished in 3:31. Like most people, I figured my best running days were a young man’s game. I assumed the years ahead would only get slower. But the opposite happened… 

Over the next decade, across nine marathons, I didn’t slow down. I got dramatically faster. In 2024, at the Goodwood Marathon, I ran my personal best: 2:59. I was in my forties, supposedly long past my prime.

So, what changed? It wasn’t my age. It was that I finally started training properly. In my twenties, my approach was haphazard. I’d overpace early in races and burn out. I never put in the real work. Now, I focus on consistent mileage and real structure.

The number next to your age in that table is not your ceiling. For most of us, it’s nowhere close.

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