That is actually true. Young people move away because they can't afford the cost of living, or can't buy houses, or there aren't jobs.
My home state of Mississippi is precisely that
Probably one third of my 1970s peers left for Dallas or Atlanta or today Nashville is a big draw
And some to Kali or DC or NYC
they tend to return when old for at least part time
I left and even though back south by early 40s I didnt go back to Miss because of better opportunities in Nashville for me