I've been using the same system for decades. Is there a way I can measure how well it does at sound quality other than the "listen to it and see if it seems ok

I've been using the same system for decades. Is there a way I can measure how well it does at sound quality other than the "listen to it and see if it seems ok" method? Because as with glasses, you get used to a prescription that is slowly degrading over time, same with hearing. How are people measuring fidelity in a home environment?