modern kid; child of today; with-it youngster
Colloquial term for a child or young person who embodies contemporary trends, attitudes, or lifestyles. Often carries a slightly nostalgic or comparative tone when used by older generations.
現代っ子はスマホの使い方をすぐ覚える。
Kids today pick up how to use smartphones right away.
My grandfather often starts talking with 'Kids these days…'