We were thinking of having my cousin come and babysit on Saturday night so we could go out for a bit. She's never babysat for us before but has taken babysitting classes. My 11 month old will likely be in bed and rarely wakes up until after midnight (we won't be out that late) and my 2.5 year old will be up 1-2 hours with her, but knows her since it's my cousin.

I'm curious what's the youngest age you would consider for a babysitter.