My DS is 6 and my DD is 4. I am not ashamed to admit that they are wanderers. While I hate that they do it, at least I know and will do my very best to prevent them from getting separated from us. While many will say that they are too old for it, leash wise, I bought the ones that go from wrist to wrist (can also go from wrist to stroller or whatever you can attach it to) I also wrote my cell number on the inside of their little bags so if they get scared and can't remember my number, they will have it written on them. (and just fyi in case anyone wonders why I didn't train them better, we adopted them out of foster care recently.... have a TON of training to do, they had very unstable lives before us.)