We're on our second. The first was bought for our eldest daughter to replace our cat that got run over. For his first year she didn't play with him too much, so we reckoned he was a fair bit depressed, so he got moved to our youngest daughter's room who was just over 1 year old at the time. She played with Big Bubbles almost every night. He lasted to 2.5 years with his new lease of life of getting duplo lego castles getting built for him. Daughter was devastated when he died, I had to tell her, we buried him in the garden. Very traumatic, so be prepared for that then the ensuing questions about death.
Replacement hamster is 'Rhino', who when she chose him at the pet shop was the one that was full of aggro - I'd never actually heard a hamster growl but they do. It doesn't put her off though, she still plays with him most nights, and he's mellowed out a bit now in the 10 months we've had him.
Their pee does smell though so regular cleaning essential, and if you have the misfortune to be peed on, it's totally honking.
I had gerbils as a kid, they're ace. Apart from the night time drumming of their feet at the slightest noise that freaked them, used to drive me nuts. Hamster squeaky wheel just as bad so ours goes in the bath at night (we give him a little life raft though).
Oh, and the first hamster wasn't one for gnawing so his teeth grew too long and out the side of his cheek which was a bit freaky. After the vet took care of that we had to trim them every so often with a tiny pair of wire cutters, he didn't much like that. And don't use synthetic cotton wool type bedding, he also got that wrapped round his teeth early on which took some struggling to get off. Use toilet roll in his bed now.
Hamsters are great though. They're not super fast like gerbils and a great way for young'uns to learn about caring for something. Daughter is 3.5 years now and really takes care of Rhino, likes cleaning him out, feeding him carrot and apple, etc.