I think saving bitcoin for a long time is not a good idea and is too risky due to bitcoin prices are unstable and hard to predict, even though we know bitcoin prices have ever jumped till $ 16,000, but now the bitcoin price down to $ 8,000. In my opinion, you should doing bitcoin trading by buying low and selling high to get profit. And you can save every profit that you earned as a savings for your future. Nobody know how long bitcoin can survive because until now there are still many countries that refused bitcoin.