a backscratcher, typically made from bamboo or plastic, used for scratching one's back

他手里拿着一把木制的老头乐在挠痒痒。

various products designed for the convenience of the elderly, such as padded shoes or low-speed electric mobility vehicles

这种被称为“老头乐”的小型电动车在老年群体中很受欢迎。