Yes, I agree that millennials should start investing cryptocurrency now while it is still affordable especially for those altcoins like ETH, Neo or LTH where it could give them assurance of a great gain on their investment until their retirement period. I think even for the middle age individuals like within their 50's, it is still not late to do investment for their retirement also. There profit gains can help them supplement to their medicine needs since as we grow older, we can't deny the fact that we will be suffering some health problems.