Adolescence /ˌæd

infant /ˈɪn.fənt/ noun YOUNG CHILD
1. [ C ] a baby or a very young child
a newborn infant
knowledge /ˈnɒl.ɪdʒ/ /ˈnɑː.lɪdʒ/ noun
1. [ S or U ] understanding of or information about a subject which a person gets by experience or study, and which is either in a person's mind or known by people generally
Her knowledge of English grammar is very extensive.
He has a limited knowledge of French.
The details of the scandal are now common knowledge (= familiar to most people) .
She started to photograph the documents, safe in the knowledge that (= knowing that) she wouldn't be disturbed for at least an hour.
In this town there are only a couple of restaurants that to my knowledge (= judging from my personal experience and information) serve good food.
2. [ U ] the state of knowing about or being familiar with something
The Government deny all knowledge of the affair.
It has come/been brought to our knowledge (= We have discovered) that several computers have gone missing.
maturity /məˈtjʊə.rɪ.ti/ /-ˈtʊr.ə.t ̬i/ noun [ U ] DEVELOP MENTALLY
1. mainly approving the quality of behaving mentally and emotionally like an adult
2. mainly approving a very advanced or developed form or state