They wouldn't last in any hills, would not be able to survive without their cell service and internet and constant validation.

That is the type they send to the front too, the youth and the idiots. The ones that can't do anything useful. Most of my ancestors in the WW2 age group either avoided the draft entirely because of the nature of their jobs, or were given mechanical jobs in the war. They were full grown adults with mechanical skills and experience valuable in other ways. The ones jumping off the D-day boats were the kids.