Well, yes. I didn't run in HS or college and I never ran a 1-mile race until age 57, when I entered one (a road mile) on a lark. OMG, I thought it was going to kill me. I did set a PR, although probably 1:30 or so slower than what I could have run in my prime.
I struggle with that at 40. I see tons of runners on insta, Strava and on reddit that are super-fast and I have to remind myself of that too--a lot of them are between 18-35 and in better shape. Thanks for putting that into perspective!
My point is that those people who say "I am still hitting PRs and I am in my 40s!" are almost always (95%) runners who started training seriously in their mid- to late-thirties. That is fine and I am happy for them. That is a fun way to be part of the sport! Congrats!
The "but if" is just as reminder that they would have had even faster PRs if they had done the same training and racing a decade earlier, and as such, they would not be setting PRs in their 40s.
The answer to the OP is "if you trained and raced in college, you hit your PRs in your 20s. If you start much later in life, you probably PR after 3-5 years of serious training."
p.s. I will admit that I am 100% jealous of people who are still running well in their 40s but I would not trade all the fun I had between 14 and 30 when I was grinding out mileage and racing 50 times a year.
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The problem with that line of thinking is that in Boulder, San Diego, Seattle, Portland, and many other cities with active populations, the old runners are also crushing it!
When people hear that I finished "20th overall in the XYZ road race" they say, we'll that's pretty good because you are twice their age! But what they don't realize is that something like half (or more) of the top-20 in most every road race are masters runners!
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Good post, and I needed to hear that. I turn 41 in November so this gives me hope that I still have a little bit left in me.
Lifetime goals are to break 3:20, 1:30, 45:00 and 18:33. Once I break all four goals I'll be done. The sub-threshold thread has done wonders in terms of helping me create my own plan. I looked into Jack Daniels but his plans are too involved at times.