noun
suitable age; appropriate age
Often used in fixed compounds like 適齢期 (marriageable age) or 労働適齢 (working age). As a standalone noun, it refers to the age considered right for a particular activity or stage of life.
彼女はそろそろ結婚適齢期だ。
She is reaching the marriageable age.
この仕事には適齢がある。
There is a suitable age for this job.
適齢期 is the more common compound meaning 'marriageable age' or 'suitable age period', while 適齢 is the base noun often used in formal or written contexts.
Compound of 適 (suitable) and 齢 (age). The reading てきれい follows standard on'yomi.