Big ass, tits sag with age, but a good big ass looks good at any age.
I've never seen a toilet passed a certain age with a nice rack, meanwhile a good ass stays hot. Also, you can train to get a nice ass or you can eat to get a nice ass. Big breasts are purely genetic ans I already carry the genes for that, so I don't see how it will benefit my daughters to give them back problems at a later age (like all the females in my family have because their breasts are too big), I'd rather compensate that with a nice flat Asian rack, but a big ass on an Asian is an amazing bonus.