We just had the tooth fairy visit last night
That was after my 5 year old had the tooth DANGLING for weeks now (his adult tooth had already broken through the gum and was pushing up). I couldn't take it anymore, I just kind of wiggled it, came up with some excuse with a paper towel and got the thing out.
It really all depends on the child. My oldest got braces in October, before they put them on they do a whole mouth x-ray and they can see the adult teeth that still need to come down. She still has 11 baby teeth to lose and she's 12. She didn't lose her first one until she was probably about 7 1/2, then hers take a while to come out. Her adult teeth did come in behind her baby ones but the dentist said they would come out on their own (they did -so she never really had a toothless grin). She did have to have one pulled that the adult tooth came in behind it before getting the braces on though. Looks like another adult tooth is trying to pop through the gums without having the baby tooth get out of the way, so probably another pulled one eventually there too.
My 9 year old - I tell you he would have a loose tooth, it would pop out, I would turn around and he would have another loose tooth! The tooth fairy was visiting what seemed like a couple times a week. They all just decided to fall out at the same time.

He was younger than DD.
My 5 year old just lost his first one.
*I* had to have several baby teeth pulled when I was in Junior High (13-14 years old - they would get a cavity and the dentist would pull it...if i hadn't gotten cavities who knows how long they would have stayed in there!), so I am just assuming my DD is taking after me for hanging on to the teeth. I didn't get my first loose tooth until I was 8 and that was only because of an accident. I'm not really sure *when* they would have gotten loose if I hadn't accidently helped it along.