Im 34 and getting close to a national qualification. I didnt started running gear until about 5 years ago. Bloodwork 2-3 times per year, a very strong regiment, I feel I will compete into my mid 40's and then start looking at things from a longevity standpoint. However it really just depends on how my health holds up. Between the bloodwork, calcium scores, ekg etc.... if those things keep coming back with no issues, then I see no issue?