noun-modifying (irregular)
of tender years; very young
Fixed prenominal expression describing a child who is still very young. Often used in literary or formal contexts.
See also: 年端もいかない
年端もいかぬ子供が一人で旅をするのは危険だ。
It is dangerous for a very young child to travel alone.
年端もいかぬ娘にそんな重い責任を負わせるべきではない。
You should not place such a heavy responsibility on a girl of tender years.