na-adjective, noun
youth; young and vigorous
Refers to a person's youthful prime, often with a nuance of energy and promise. Used in formal or literary contexts, such as describing a promising young person or a period of youthful vigor.
彼は少壮の政治家として期待されている。
He is expected to do well as a young and promising politician.
少壮の頃の思い出を語った。
He talked about memories from his youthful days.