Mine is from 10% younger than myself to 40% older than myself. This formula should work whatever my age happens to be.
Mine is pretty backwards from yours. I'm 39. Theoretically speaking, because I'm married, I'd date from 25-40, or about 35% younger to about 2.5% older.
I really don't understand 40+ year olds who expect people in their late teens to want to go out with them
I'm not quite that range yet, but I get hit on by younger girls a number of times. Not generally teens, but mid 20s isn't unusual. Although, I was on a flight and this 18 year old girl hit on me. I thought she was 20 though! But, it's all in fun. I think younger people are more attractive.
Mr Awe