I've always been curious about this too. Here's a little breakdown of recent (male) grads from my school. *Note this is for guys who ran 800m and longer.
Class of 2019:
1 hobby jogs ~3 times/ week
1 continues to train and race
1 injured since outdoors (future unknown)
Class of 2018:
1 trains/races on the road
1 hasn't run since
2017:
3 hobby jog occasionally, mostly injured since being on team
2 hobby jog
1 training/racing for olympics
1 unknown. assuming no running.
2016:
1 hobby jogs sub 25 minute 8ks
1 hates running. probably wandering through the forest
1 hasn't run since.
2015:
4 no running
1 cycling competitively
1 trained for olympics. missed 1500m standard by 1 second. hobby jogs / cycles now
1 trains/ races still
2014:
2 hobby jog
4 don't run
1 ran 1 year, transferred to Div 1 for 1 year then quit.