beer
The easiest way to see if someone has passed 10-15k hrs or not is by looking at their left arm, usually it reminds me of aligator skin. Brown, pink and lighter colour variations in different patterns.
I know a couple of captains who has had skin cancer but I don't know if the percentage is bigger compared to the rest of the population. But I doubt it is very healthy.
Considering that you have 8 night flights, 5 earlies 8 evening flights every month mixed up, having your dinner anywhere between 1600lt and midnight, not doing any proper excercise, exposure to radiation etc you are likely to age alot quicker than normal
