Should I tell my parents I'm dating my college professor?

I'm an 18 year old college student and I've been dating my college professor for quite awhile now. It's getting pretty serious, but because of the rather large age difference (20 years) I've kept it a secret from my parents, whom I still live with. He's divorced, so he's not cheating or anything, and it's completely consensual, but it's just been getting harder keeping this from my parents.