Pretty straightforward. Is there anyone who has an (expert, hopefully) opinion on this: If you do intense exercise (weight training included)?
Telomeres are at the ends of your DNA strands. Everytime DNA splits into a new cell, the telomeres or the telomere distance gets shorter. If you are adding bulk and doing exercises for your muscles to need to repair themselves after a workout, it seems like this might make your telomeres shorter faster. Plus, intense workouts seem like they could be hard on the joints of your body. These two factors seem like they should result in premature aging and decreased longevity.
Browsing a few titles of search results on bing, it looks like there is a correlation with (at least weight training) keeping you young.