
Don't date someone out of your age bracket. There are possible exceptions, but generally I would place these brackets at:
12-21: no more than 2-3 years age difference.
22-35: no more than 5-7 years age difference.
36-55: no more than 10 years age difference.
56-65: no more than 15 years age difference.
66-?: anyone with a pulse who will date you.