redsingergirl
Eh..that's a really really big age gap. Even if you tell him, there's a really small chance that it'll work out in the end. It depends if you want to deal with the booze in your relationship or not really, because chances are he won't stop drinking. Your choice.
It's not the age gap, it's the maturity. I'm 16, and I am considered dateable by 23 year olds. Even when they know what age I am.
If you want a relationship, just start imagining if he were your best friend. Not romantic partner, but
best friend. Could you bear with this man that drinks? Well, most people you wouldn't want to have as a best friend. Unless you want sex (which any sane man would refuse if you happen to be 15), it's probably not going to work out.