Your chances of being together and happy are about the same as anyone elses if you are both mature adults. Hopefully, your relationship is not based on looks but something more substantial - trust, friendship and love with common interests.
I come from a family where almost all the men are younger. I married a man just a few years younger, my sister is married to a man 10 years younger and my Mom is married to a man my age. Also, my father-in-law is married to a woman my age.
When I said almost all the men - well, my daughter is unique - she is married to a man 10 years older than her (10 years younger than me). When I asked her jokingly "what have you learned from the women in our family?" she simply replied "Age doesn't matter!"