Is it OK to sell old coins?

I'm curious, is it advisable to sell old coins? On one hand, they may hold sentimental value and be passed down through generations. On the other hand, they could potentially fetch a good price in the market. What factors should one consider before making a decision to sell or keep these coins? Additionally, are there any risks associated with selling old coins, such as being scammed or encountering legal issues? I'd appreciate any insights you could provide on this matter.