How long do you or should you keep your gear.

I kept my Infinity Reference Standard 2.5s for 25 years.

I still have this (an X-mas gift when I was 4 years old).

My father used to borrow it, when the power was out, to check weather alerts during rain/snow storms.

It was eventually superseded when my sister got her first battery powered transistor radio.

DeKay

To each their own. One of those topics that people do not need some guy on the internet to tell them what they should do.  It's a very trivial thing on the grand scale of things after all, eh?