If you want a retirement fund or if you want to secure your future then buying bitcoin or collecting it while you can is the best option for you to have a secured financial future state. Most of the people are putting their bank account savings in bitcoin because they believe that bitcoin has more potential than the interest which is very low in banks.
That is correct most of the money that i have in banks are now in bitcoin because i believe in bitcoin that it will become much expensive in the future and after at least 10 years, it will become a very expensive and after that, i will sell my bitcoins to buy the things that i want and have financial freedom and it is much shorter rather than other retirement fund or option.