Hey, administer that required dope slap and welcome to official Geezerdom™ and the necessary Senior Moments™ that come with that. (Forget to have those Senior Moments and you lose your Golden Age Discount Card.) Please note that one need not BE any particular age for Geezerdom™, it comes upon you at any age when you find yourself doing something like that.
I don't have one of those fancy black tank flushers, but I have had the DW come in the house and ask me why water was pouring out the side of the camper where I'd been filling the fresh water tank and forgot it.