Any ideas what could happen to your BTC holdings if your storing them on an offline hard wallet and want to sell them 5-10 years later? Would there be code issues where the BTC you have now will not be recognized or cashable at that that time ?
Im curious because I bought a hard wallet but have no idea how usable the BTC version i have today will be in the future?
Normally no as many hardware wallets have already prepared their wallets to be ready for a hard fork in bitcoin. You are already a member of this forum so all you need to do is to read the forum often. This way you will be updated with any new regarding bitcoin and what happens to it. If you bought one of the latest hardware wallet from a big brand like Trezor should be no problem.