Of course, you can. It's your own business. But make sure you both have the same aims and desires. How are you going to live together? Do you have much in common? Will your partner have children when you are ready? If yes, that's ok. I used to be against such relationships, but my good friend met a man who is older on a dating site (you can check the silversingles com review if interested). They've been together for more than three years and they are happy. That case made me change my mind.
look into your self if u feel comfortable with it then go a head