It's normal for people to make plans for retirement and before I got to know about crypto and Bitcoin investment, What was a normal routine for most business men that are self employed around me was to use their period of active service in building fleets of houses they would normally give out on rentals which after they're at the stage of retirement and are off the active service would serve to take care of all there upkeep till they grow old.
In human society, this type of investment in real estate (houses and apartments) continues to persist, which can be rented out for a fee or sold as a last resort. Almost
every fool knows and practices (or plans) about this method of investing and receiving an additional pension.
From what I've come to see, such investment has lots of disadvantages and limitations due to unforseen circumstances like war and government policies that could make the cite of the buildings inhabitable thereby making the investment unprofitable and sometimes most men at the point of retirements, discovering that they can't get access to all they've invested into become traumatized in the process.
Also, natural disasters and population migration to better areas (both within the city, the country or the world) can significantly spoil the ROI of these investments. Don't forget about investing poorly in the wrong area. So, investing in real estate also involves many risks, despite its initial apparent simplicity.
Investing into Bitcoin is good and for the time being, we can actually make a ten year speculation on the fact that it will still remain a valuable and profitable investment but the question here is;
Until now, investing in bitcoin has been profitable, but no one knows whether this will stop before you retire. It makes perfect sense to include bitcoin as part of retirement investment portfolio, but whether should build that portfolio 100% - sounds risky.
Is it wise and realistic for someone in his early twenties to set up Bitcoin as a retirement plan such that he continues accumulating Bitcoin from this time till he gets to his retirement age?
In short, why
not YES. By the time a twenty-year-old guy retires (if everything goes well), it will be approximately 40-50 years, his pension and investment portfolio will show crazy returns (assuming the current growth dynamics bitcoin over the last 10-15 years are maintained).