Willem de Kooning is generally credited for coming out of the painterly gates strong in the forties revolutionizing art and abstraction and reaching incredible heights by the early fifties and then tailing off.
Skinniness is not your friend when you're over 40. I'd like to gain a good 10 pounds but I did always have a fat round face that plagued me when I was young. When I started to make movies I couldn't look at myself.