40 years old

The mouse:

The name was never meant to stick. When Doug Engelbart and his team at the Stanford Research Institute in California designed a computer controller encased in a carved-out wooden block, with wheels mounted on the underbelly, one researcher nicknamed it a ‘mouse’. ‘We thought that when it had escaped out to the world it would have a more dignified name,’ Engelbart recalled later. ‘But it didn’t.’