(I'm from the Philippines.)
Personally, I image that if we could put 7 billion people to work on the more important problems, we'd still need a lot more fall short on resources.
I'm kind of old (35) and a CS student, I started fairly late in my 39ies. But I only was able to do so because I payed a high price for that. Nearly everybody else at my age has a family with kids, many of them even have bought their first house. Not me, I'm studying, I'm one of the very fiew 35 years old students at the university.
And yes there are legitimate reasons why I couldn't start to study earlier (which I won't get into right now). What I want to say is that education is _very_ expensive for the student, even if here in Sweden I don't even have to pay for the university myself. Many people who would be able to learn and do the STEM jobs can't because they're stuck in survival mode earning a living at a job which doesn't help humanity, instead it is only there to keep someone ocupied.