My age or slightly older. I don't think I could date someone who is younger than me as I'd prolly feel more like an older sister due to the person being less mature than me.
I would have to see the person's maturity level. I've run into too many people that were my age or older that made me question how they dressed themselves and got to work each day, and I've known younger that demonstrated higher level of maturity then their age would indicate.
With age comes life experience, usually maturity from said life experience and a sense of independence. I prefer no younger than whom im with, 24. If you can't function as a mature adult and still rely on mommy and daddy, no go for me.
but seriously I would prefer younger but at least maybe 2-3 years older, but no more than that.
If you can handle me and understand my actions then any age is fine, though I would not like some who is really younger than me lol.