Who works as essential infrastructure for society?

This thought just occurred to me, but I don't know a single person my age who is working in any kind of infrastructure role. My cousins and friends all either went tech or work in blue collar type jobs, like warehouses, retail, etc. A few people are in the medical field, but overall I don't know anyone in my generation who is in engineering, sciences, politics, or fields like electrician/plumbing/architecture/etc.

Maybe my bubble is just small, but when everybody older dies, do we got this?