Off the top of my head:

• Two of my guitars
• Living room table
• The steak knives (our cutlery in general is somewhat new, but the steak knives are ~30 years old)
• I'm sure I have misc cables older than 20 years. Network, serial, IEC, etc. And yes, I use serial cables often.
• Our kitchen stove is around 20 y.o., but the kitchen is next up on the renovation agenda, so it won't be that much longer
• Does my GF count?
• I have some really old clothes that I still wear. One example is the Soilwork band shirt, bought at a concert when they were touring for their newest album "Natural Born Chaos"
• A guitar pedal with a 60s style distortion (the pedal is from the 90s, though)
• We live in an old house, so many of the lamps are pretty old too.
• My basement toiled was installed in the 80s