My keyboard the HP SK2885, that might be 10 years of daily abusing i can't exactly remember when we got it.
My HDD the WD Blue 500GB, runs well since like 2013, gonna be replaced with a 2.5" SSD soon.
My old Genius Mouse that one lasted for more than 10 years, i replaced it with a Redragon Griffin less than a year ago and i'm still not used to it.
the oldest thing i'm still using right now is definatly my mouse pad, idk when did we get it all i remember is that this is the first and only mouse pad i've ever used since my birth (btw i'm almost 17 and i started using computers at 4-5) it's just a cheap small mouse pad with a wrist rest that my hand doesn't accept any mouse pad without it, my current monitor and my previous case are all around 10 years old know.
And i have a Pentium D945 collecting dust, too many good memories about not being able to do anything with it.