Me and a lot of my friends lost our virginity early on in high school. I can say in all honesty that we regretted it. At 14, there's still a lot of growth and maturity you will encounter throughout the years. The person you lose your virginity should be someone you love and who loves you a great deal as well.
If I had to give you an age, it would be 30 but I know that probably won't happen. LOL. So I'll say early to mid 20's.