The young age group; people of relatively young age, often referring to teens through the early thirties depending on context.
若年層のスマホ利用率は非常に高い。
The smartphone usage rate among the young age group is very high.
政府は若年層の雇用支援策を発表した。
The government announced employment support measures for the young age group.
ワクチン接種率は若年層でやや低かった。
Vaccination rates were somewhat low among the young age group.