I'm 22 and I prefer older, as do a lot of the girls I 'work' with: girls tend to prefer respectful, fun, and friendly regardless of age.
Its not about bringing extended stamina, fantastic looks and a 10" dong to the session. Its about having fun and relaxing in a sexual setting, getting to know someone new, and exploring new sex with new partners. IMH(Experience, with several very notable exceptions) older gentlemen are less nervous, more likely to joke around, and have a broader variety of topics in which they are well-versed.