As a society we're obsessed with upgrading and replacing, so as soon as we've bought a new computer, media player or games console, we're already hankering after the next one. Usually the previous model is chucked in the bin - or at best saved for a car boot sale - but the experts claim that if you've hung onto any of it, then it might be worth serious money.
A study by TotallyMoney has revealed some of the most lucrative retro technology, so you can check if you have any of the models lurking in the attic.
Top of the list is a Thorens TD-124 Turntable from 1961. If you gleefully threw yours away with the emergence of CDs, then look away now - because they sell for up to £1,438.
An Apple Macintosh 128K from 1984 is unlikely to be gracing many desktops, but if it's stuck in the attic, then dig it out, because selling it could net you as much as £1,274.
We might be able to blame hipsters for the next on the list - the Underwood manual typewriter. They were chucked out with the advent of the computer by anyone with a low tolerance for noise and insufficient finger strength. Now they are in great demand among hipsters, and they fetch as much as £994.
In the age of digital photographs and selfies, Polaroid cameras are making a comeback. If you have an old 195 model from 1974, then it's worth up to £561.
Still pretty valuable
JVC VHS players were everywhere in 1994, and are now largely in landfill. If you still have an old model, then see if you can sell it online, because these have fetched as much as £355.
The Casio Calculator Watch was the coolest thing to have in school in 1985. Apparently it's now cool all over again, with models selling for as much as £283.
Having a Sony CD Walkman in 1994 made you very cutting edge. 22 years later you're unlikely to own many CDs, let alone a Walkman. However if you have one stuck in a box somewhere, it could make you up to £273.
The Nintendo Gameboy only dates from 1989, but has plenty of retro appeal. They have fetched up to £259 - which is considerably more than their modern equivalent - so you could sell your old one, buy a new one, and still have about £100 left over.
You'd be forgiven for thinking that nobody has the time or patience to dial an analogue phone, but if you have one from 1970, then you could get up to £51.76 for a particularly 'retro' model.
Another relatively new 'retro' classic is the Nokia 3210 mobile phone, which was around in 1999 and almost everyone seemed to have one. These have fetched up to £42.60 - so check the drawers in the study to see if you still have an old one.
"It's surprising how valuable technology from the last 10 years can be now," says Joe Gardiner from TotallyMoney.com, "We tend to think of retro technology as worthless, but there is a whole niche where people want to remember and restore these items. So get rummaging through your drawers, attic or garage – your junk could be making you a fortune!"