Should you keep old keys?

As a cryptocurrency investor, I'm always seeking the best practices to safeguard my assets. With that in mind, I'm curious about the age-old question: should one keep their old keys or discard them for newer, more secure options? On one hand, old keys may be vulnerable to security breaches, but on the other, they hold sentimental value and could potentially be linked to valuable assets. What are your thoughts on this dilemma? How can investors strike a balance between security and sentimental attachment when it comes to managing their cryptocurrency keys?