Why develop "age reversal tech" if people become superfluous, unemployed, impoverished? Are people going to stop having children? If not, reversing ages will wind up swelling the population in terms of unemployable people.
This is where we currently are with autonomous vehicles. The service has gone live in a small part of the world and it's pretty damn impressive already. Just imagine how much better it will be in 10 to 20 years time and be certain it will have reached everywhere important.
I do agree on the software thing replacing white collar jobs at a greater rate than blue collar jobs - the latter requiring expensive hardware - it's just that as examples machines make more impact than algorithms. But either way the point remains valid that tens of millions will be losing their jobs, and there doesn't seem to be anything on the horizon that would absorb that labour. The upcoming technologies are VR, AR, and autonomous vehicles. They will all create some jobs but they certainly won't be for the low skilled. I'm white collar and not young, they're unlikely to even be for me.
What is the solution to a world in which tens of millions are made unemployed and their age and technology means they have little chance of being employed again? What is the solution to a world where ever fewer young people have to support the pensions, social care, and health needs of an ever larger number of old people? How is government debt to be repaid or inflated away with both of those things in play? Either aging reversal tech is developed in the next few decades, or the state intervenes and radically changes how things work - a Great Reset you could say - or people start burning shit down and stabbing each other.
Lets be honest, not everyone is capable of STEM jobs, and not everyone is welcome into STEM fields. What is the "Master Plan" for them?