I never ran as a kid. I started around age 39, and it really got me into shape. I'm lucky to be naturally thin already, but things still changed in a way that I was not comfortable with in my mid 30s. I'm almost 53 now, 6' tall in bare feet, and under 165 lbs. so I feel like I'm doing alright. I also do some light yoga, pushups, curls and sometimes crunches and knee raises. I also play about 50 gigs a year. The running is only a couple days a week, a mile or 2, but really seems to help with metabolism. I'm energized all morning after I go.