na-adjective, noun
being older or a senior; the first half of the year
This word has two distinct meanings. The first meaning refers to being older or having seniority. The second meaning, 'the first half of the year', is a rare, archaic usage that is not commonly encountered in modern Japanese. It may appear in historical or literary contexts.
彼は私より年強だから、敬語を使うべきだ。
He is older than me, so I should use polite language.
年強の人は経験が豊富だ。
Older people have a wealth of experience.