All my gear is old and very well used
Find if you buy (aquire) quality it tends to last well, just trying to think what my oldest bit of gear is.
My 45l POD rucksac circa 1996 has been terrific, been all over the world and done a lot of big climbs and the ravages of sac hauling, got reduced it in a sale. Its on its last legs now and I have its replacment for when it bites the dust, its a Lowe Alpine got it from a car boot for a fiver.
Got a montane version of a buffalo jacket and mountain equip salopettes from 1989
My Mountain equip Redline sleeping bag is over 30 years old (1984) and still brill, got that as a part of a sponsorship deal for a Karakoram exped.
Back into the mid seventies I have a pair of Terradactyls axe/hammer, Chouinard ridgid crampons and stoppers, set of rp's, original set of friends 1to4.