At 58, I was injured, and that combined with work and moving states meant I did absolutely nothing for four or five months, and put on about 12lbs.
The first day I started up again I ran a 5k time trial on the track - nuts I know - and ran 19:45.
If a fat out of shape 58-year-old more or less complete de-trained can run 19:45, then 25-year-old generational talent, fit from active farming lifestyle, Bekele runs far, far faster.
My guess is that he'd break 16:00 mins.