My "Retire at Age 50" plan is based on saving around 30% of what I make and putting half of that in BTC, and the other half on speculative assets.
The classic thesis that the younger you are the riskier you can invest is bollocks. The younger you are, the SAFEST you can afford to invest, because you have TIME to make up for lower yields and to compound.
When you are old(er) and for XYZ reason haven't been financially capable of building up that nest, like so many people around my age now, that's when you have to go balls to the wall and look for maximum yield, all be damned.