Hey,
I think it depends on your personalty. For myself I am young (21). I am very quite and laid back. Some or most people that works for but, I have flown with people who I think that being quite like that gets them kind of nervous. Age too has something to do with it. I had a guy once I was supposed to do a check out for and he came and asked me how many ours I had. I told him 875 and he said he didn't want to fly with some kid. He was a CFI too. Kinda crazy. So its really who you think you might be comfortable with. Hope this helps and when in doubt try to pick a cute girl to fly with.
Chris