Oh, I didn't count the computers and game systems used by the other three members of the family. (Three generations of Nintendo systems: NES, SNES,Game Cube. Plus a playstation. And three additional PCs.)
And my very basic sewing machine may not count as a gadget, but those fancy ones that do sew-and-trim serging or computerized embroidery certainly do! (I lust after one of those, I do... but I've never had the spare cash at the right time to get one.)
I was noticing while visiting a friend recently that he still has his Betamax hooked up. I wasn't buying gadgets when the Beta was available, and have never been prone to spend money on "TV" stuff. I think my oldest gadget is probably a Casio mini-keyboard that also functioned as a calculator (and was used as such in one physics test in high school when my TI-88 ran out of batteries), but that assumes that whichever daughter borrowed it still has it and didn't toss it in our last move.
We could talk about kitchen gadgets, too.