I started running with 19 and had my best run splits in my early twenties: not very impressive because firstly I weighed 84 kg @1.85m and secondly I did not know a lot about training, racing and fueling. My PBs are:
Half IM 1:21
Marathon: 2:59:36 (this is a number I'll never forget)
and
10 km: 37 minutes.

Only since 10 years I get relatively better and better compared to my AG, because I'm declining slower. I even get competitive in local running races, which was not so when I was in my twenties.

One poster wrote here above I'm 90 kg, but that is not exactly right, it is about 86 or 87. As I wrote, too much due to homeworking (miss the bike commute to work).