Try it all. You'll reach a point where you have narrowed it down to what you like; what feels good to you -- where all the nooks and crannies fit.
Personally, I like 'em petite but with muscular definition. My FB is 5'1" and has the Joan Jett thing going on (plays bass in a band) -- leather jacket, insane hair, and a taut little tummy. I'm big on the stomach.
The CHB I just broke up with is as tall as me (5'10") but has a slim build, B-cups, and legs for days -- the ballerina look, with long toned muscles. She is a real stunner. So I guess height is not as important to me as @$$ and hips. Don't like the "child-rearing hips." I consider myself adequately endowed, but every (white) girl I've fvcked who has that corn-fed, broad-shoulders / wide-hips build has been like fvcking a glass of hot water. Not my thing.
Actually, that broad-shoulders / wide-hips thing is cute to me if she's petite; I could always go for a curvy little bubble-bvtt. Especially if she has dimples. Hmm. That just occurred to me.
Age doesn't matter to me. I once had a FB who was 39 and she was spectacular. My current FB is 20 and still solidly in the sexual experimentation learning curve, but she's two floors below my apartment so you can't have everything.
The main thing -- #1 thing -- for me is the smile.