Sounds like a good plan to me. I haven't really thought about using crypto currencies alone as my retirement money, but looking at the current values the money should be more than sufficient. Right now 10 BTC are worth around 280,000 USD, and 100 ETH are around 175,000 USD. That is more than enough for one person to live off in retirement. I read from some insurance sales person that you should try to accumulate around 300-400,000 USD for retirement. It of course depends a bit on if you own your own house or apartment where you can life rent free. Also with so much money in crypto currencies you will profit of any further increase in price, the long term trend for both BTC and ETH is positive and the prices should keep rising over the years. Once you turn 60 or 65 you wouldn't sell all your cryptos at once, you only sell a little bit every time you need money. So it could easily happen that the price is going to rise a lot in 10-20 years and will leave a lot of the coins behind for your children and grand children.