I know a runner in his early 50's who runs 17/18 min 5ks.
My mate is the same age as me and can run 18 mins (both 48).
My other mate (same age) has only taken up running over the past year or so and has gone from 28 mins to 20:30....the utter bastard will get sub 20 before me :(
I only took up running five years ago and I've missed most of this year to covid.
Determined to get under that time, but more looking forward to doing some half marathons around Europe next year (weekend away type plans).