I think so, yeah. I babysit. Mostly family, but I babysat the same 2 boys for 2 and a half years, a 5 and a 7 year old. Its fun, but it can be really difficult. For instance, I babysat a 14 month old, its REALLY hard, I would start with some family or some family friends, that way, if you make a mistake, they are more likely to be understanding. It can be hard at times, but dont be afraid to call the parents if you need help or advise. A tip: If the kids arnt listening, threatening to tell they re mother/father does help sometimes, :P But you dont actually have to. Also, if you are doing it with friends, make sure you still remember to do your job.. sometimes you can get into hanging out with your friends, and not pay so much attention to the kids :P If you choose to babysit, remember the most important thing is to stay safe, and have fun.
I was babysitting when I was 12... though I hated it lol. If you decide to do so, hopefully you ll like it better than I did!
