壮年

彼(かれ)は壮年(そうねん)の男性(だんせい)だ。

He is a man in the prime of life.

父(ちち)はまだ壮年(そうねん)で、体力(たいりょく)もある。

My father is still in his prime and has plenty of stamina.

壮年(そうねん)男性(だんせい)の健康診断(けんこうしんだん)は特(とく)に重要(じゅうよう)だ。

Health checkups are especially important for men in their prime.

壮年期(そうねんき)は仕事(しごと)も家庭(かてい)も忙(いそが)しい時期(じき)だ。

The prime of life is a busy period, juggling both work and family.

祖父(そふ)は壮年(そうねん)のころ、会社(かいしゃ)を立(た)ち上(あ)げた。

My grandfather started the company when he was in his prime.