They’re creakier than they used to be, but for the most part they still work: they flex, move, and operate when I command them to; only leak a little bit; and generally keep me in good stead.
My 50 year old (plus) flesh and bones?
Those, too.
But I was actually thinking of my 50 year old (plus) Living Room casement windows — which also date back to 1959 (and look like they’ll make it through the next couple winters just fine).