Old high school friend of mine was a life long avid runner/marathon guy. Bilateral knee replacements at the age of 51. He swims now.
When that check engine light comes on, don’t ignore it.
Jim Fixx didn’t eat well. He was also a long time cigerette smoker. Avid ciggie smokers average live span is into their early 60’s.
One of my uncles smoked and jogged, dropped dead on one of his morning jogs.
Another uncle smoked a pipe for 50+ years and died a lingering cancerous death at 74.
A friend if mine wanted to be a triathlete and began training for them. He went all in allowed himself to be consumed by a unhealthy training regime thinking he could be the best. His best time so far is just under 12 hours and now he looks to be about 75 years old as opposed to a healthy looking 60 year old who exercises regularly.