Would you say that fitness (or at least being thin) and youth is more important to be found attractive in the gay community than the straight community?
I'm talking about for men, not women.
My impression is if you are young and fit or young and twinkish, you'll be a hot commodity among gays, but once you're old and heavier, your stock goes way, way down.
Whereas with straight guys, often they can get the same or better quality of women as they get to around 40, even if you remove money from the equation.
But given that I don't have personal experience with the gay side, I will defer to you.