If your friend decides to retire and enjoy the money from selling the Bitcoin he owns for the rest of his life, that means the profit he gets is certainly very large.
I might keep working or building my own small business rather than retiring by spending all the money I make from long-term investments for living expenses. The needs of old age may not be as much as when we are still productive in making money, but when life experiences some problems, it can be related to health, which will also require a lot of money.
As long as I can still be productive in making money, then I will work. Either as an employee or with my own business. Everyone has a moment to enjoy their retirement.