trust is key. any age is good within reason. if you are strict with her she will go behind your back, if she's young then build on your relationship in a way where she won't keep things from you. Take this from a girl whose mother was strict with her until I took it into my own hands to create a relationship where I could tell her everything and be honest about what I do.
15-16 would be a fair age. She will be mature enough, and the guy will own up to his responsibilities. Don't be afraid to take charge, though. If things get out of hand, you can easily say no. Remember, you are the boss!!!
Well i wouldn't let my child hang out alone with a guy until shes eighteen and have learn alot about the world and people in general some people aren't really good people some people are really great people but i would want my daughter to know the difference so shes not trusting every guy out there and honestly i would let my teenage still see her boyfriend when his or her parents are around or when theres like a group date or friends gathering or when you have met this guy and have gotten to know him as parents you should know who your daughter is dating and get to know him first before letting her hang out with him
I wouldn't. Actually, I would encourage her not to date until she was in a position to consider marriage. When one does date it's good to have a chaperone to give you the strength to control sexual urges when your with your boyfriend. This allows you a better chance of not looking back on any regrets. "Shrewd is the one that has seen the calamity and proceeds to conceal himself, but the inexperienced have passed along and must suffer the penalty."-proverbs 22:3