It could be hidden away in a garage or tucked in the corner of the loft.
But it might be worth bringing it out because you could be sitting on a gold mine, because some old toys could fetch you a small fortune.
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We have rounded up 13 toys that could fetch you a princely sum.
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9. Teenage Mutant Ninja Turtles
Cowabunga! Leonardo, Raphael, Donatello and Michelangelo have been stars for decades now, with many different ranges of toys being sold over the years. On eBay TMNT toys such as the 25th anniversary action figures are selling for £500. Photo: LEON NEAL/AFP via Getty Images
10. Warhammer
The tabletop miniatures are more popular than ever in 2020, with the company worth the same as owner of British Gas. If you have some old figures hidden away somewhere, worth checking out if they could be worth money. On eBay collections of figures are selling for up to £5,000. Photo: OLI SCARFF/AFP via Getty Images
11. Transformers
The robots in disguise have been selling toys for decades as well as starring in series of films. If you have an Optimus Prime stored away then it might be worth checking. On eBay for example the Museum Masterline figures are selling for over £3,000 each. Photo: Justin Sullivan/Getty Images
12. Cabbage Patch Kids
Famously hard to come by in the 1980s, the Cabbage Patch Kids are still around and are still popular with collectors. On eBay a collection of five rare vintage dolls are selling for £700. Photo: LEON NEAL/AFP via Getty Images