I came from a society where majorities are not bothered about their retirement plans, Some do have the financial resources but due because of financial revenue opportunities, they feels so reluctant and comfortable without considering that depending on the government opportunities could get to an end somedays. I don't know if they ever have the picture imaginarily about how their old ages times would be.
I can certainly say that elders from rich European countries move in poor European countries, like eastern Europe and spend there life there. Get a pension of thousand Euros, rent your motherland house and spend your life in other beautiful poor countries where your pension and rent income will give you a high quality of life. But locals from poor countries are really in trouble. Europeans mostly don't bother about retirement plans because they expect governments to take care of them when they become old.
I've decided to have a diverse of my bitcoin investment for my retirement purpose.
At some points in life, you don't expect to be thought lessions before you could learn but you can learn from others experiences.
Diverse of Bitcoin investment? You probably mean crypto investment, right?
Be sure that you don't keep your coins on centralized exchanges. Not your keys, not your coins, keep this in mind! Also, the more control you have on your asset, the higher the responsibility you have on your shoulders.