I'm 60 and ran up to 120 miles per week in my 20s and 75 miles/week in my 30s. When I was 27, I realized running two times a day in the sun couldn't be good for my skin and started wearing sunscreen. I just got carded buying wine. The guy said, "We have to card anyone who looks under 40." Get a good titanium or zinc sunscreen and wear it whenever you head outside.