Yep, its a bittersweet thing when it happens. My daughter is 22 and just graduated with her BS degree in pre-vet medicine, so in a month she will start vet school. She never thought about a gun while going to college in Laramie, but the other day she was dropping hints about how it might be a little more dangerous where she will be going to vet school. She was hinting that she could "sure use a small revolver" for protection. Uh huh.... I could tell she was describing my little S&W model 60 with the 3" barrel. She has shot it before on numerous occasions. I didn't consent to it... yet. What's a dad supposed to do though? When your only daughter expresses an interest in your hobby, how do you turn her down? I'm not all THAT worried about her safety, but still... you just never know.
I know how this gun "borrowing" goes too when it comes to your kids. My son bought his own 30-06 when he turned 14. Cool. He shot it well, although when it came time for his first deer hunt, he asked to carry my old 30-30 and he took his first deer with my first rifle but he always used his 30-06 for everything else from then. Fast forward to when he was 18. I made a deal on an absolute beautiful 7 mm mag built from a pre-64 Model 70 Winchester action with a heavy barrel, a beautiful oil stained stock and topped off with a perfect Leupold 3-9 X scope. I showed it to him the day I got it. He wanted to go shoot it right then. I was swamped with work so I couldn't do it, but I let him take it. He kinda forgot to ever give it back to me. It shoots great groups he says. I wouldn't know because I never got to shoot it even once. It went to college with him. I explained to him that what we need to have is basically like a "gun library" where he can come and pick a gun and take it for a few weeks to try it out then bring it back and try another one. When it's time to go hunting, then you'll know which one you want to use for that occasion. He kinda pondered that for awhile but then told me thanks, but he'll just stick with the gun he has currently "checked out" from the library.
Ah well. I'm not complaining though. I'm glad to see they have a healthy interest in firearms and enjoy them.