Well I think it has alot to do with who is the older party personally.
When I was 15 I was with a 38 year old woman while her husband was in
prison for armed robbery. It was short lived but a heck of alot of fun
from my point of view. As far as relationships go I personally follow a
strange rule of the person must be atleast half my age plus 7 years for
me to consider it at all. On the other side of the coin I am typically
not attracted to ladies more then 10 years my senior these days. Then
again I am in my 40s so I think it is pretty safe now.