As long as it's not a minor and you're good with your country's law about having a relationship and it's at the right age. Because there are countries that don't allow such to have a relationship with a younger person.
Anyway, I like your name and it's one famous chat wheel in Dota 2 and I know you know it.
If it is me, I can accept the difference of 15 years old. If there are too many, I am not very easy to accept. 
But what if it's older than what you're saying and you're in love? Anyway, I like your name and it's one famous chat wheel in Dota 2 and I know you know it.