Rural areas are becoming older because their existing populations are aging in place, and few young adults are moving in – and a higher retention rate of young adults isn’t enough to make up the difference. “At this point,” Lombard says by email, “the age structure is so unbalanced for most of Virginia’s rural counties that even if they kept 90%+ of young adults, their populations will still decline precipitously unless they can attract more young adults or less plausibly have a baby boom.”

I can’t find any place in the country that retains 90%+ of its young adults.

Source: No, we’re not losing young adults. We have a different demographic problem. – Cardinal News