At that age if there's no documentation that you ever knew about it, you have plausible deniability. Might be safer to report it now in case you ever have related issues and the medical paperwork reveals the past surgeries. FAA might get upset if they assume you did know and didn't report it. If you just report it now with an explanation that you didn't remember childhood treament they can't fault you for that.
Might want to talk to AMAS though, just to be safe. Also to make sure the tubes won't be a certification problem.