What age would you feel comfortable with you r LO playing in a tree house? Our new house has a really cool tree house, which is structurally sound (we had the home inspector check it) but definitely my safe for a3 year old as is (there is a railing but the openings are definitely big enough for a toddler to fall through).

I figure she is definitely too young now. But 4? 5? We can modify it by adding a better railing for younger kids but I'm not sure what age to expect her to be able to use it.

Eta: it's built into the tree and about 7 feet off the ground. There is a ladder up to it, and a grown man can walk underneath it, to give an idea on size.