Just turned four year old dd, not a runner or a wanderer, happy to hold hands nicely (tells me off if I don't hold her hand). But we're going on holiday next week to a busy unfamiliar place and she's extremely trusting and will talk to any adult she meets, we're working on that but is she too old for me to use a wrist strap rein for the week to while my hands are distracted buying ice cream or whatever?