成熟和年龄无关，更多的是教育和生活经历，我就知道很多30岁的很成熟，而50多岁不成熟的人。

Maturity is more about education and life experience than it is about age. I know plenty of mature 30-somethings and immature 50-somethings.

youdao

我那时候真的是一个不成熟的小女孩。

I was really an immature little girl back then.

youdao

我所描述的我的不成熟的心境，是那个时代的言教和身教所培养出来的。 直到今天，这种影响有没有遗留，我不敢确信。

The condition of my immature mind which I have described was fostered both by the example and precept of the time, and I am not sure that the effects of these are not lingering on to the present day.

youdao

I think more maturity can be one of the effects, one of the products of undergoing an endless, a ceaseless activity of Paiddeia, of deep education, because moral maturity comes from courage.

我认为道德成熟是不间断的，深层次的教育活动,的体现和产物，因为道德成熟来源于勇气。

普林斯顿公开课 - 人性课程节选