Adolescence /ˌæd

age /eɪdʒ/ noun PERIOD
5. [ C ] a particular period in time
the Victorian age the modern age the nuclear age
age /eɪdʒ/ noun BEING OLD
7. [ U ] the process of getting older
Her back was bent with age. This cheese/wine improves with age. Her temper hasn't improved with age!
archaeologist , mainly US archeologist /ˌɑː.kiˈɒl.ə.dʒɪst/ /ˌɑːr.kiˈɑː.lə-/ noun
someone who studies the buildings, graves , tools and other objects of people who lived in the past
century /ˈsen. t  ʃ ə r.i/ /-t ʃ  ɚ-/ noun [ C ]
1. a period of 100 years
The city centre has scarcely changed in over a century. This sculpture must be centuries old.
Her medical career spanned half a century. Compare millennium
2. a period of 100 years counted from what is believed to be the year of the birth of Jesus Christ
Rome was founded in the eighth century BC (= before Christ) .
He's an expert on fifteenth century Italian art.
3. a score of 100 runs in cricket
4. the turn of the century
the time when one century ends and another begins
Queen Victoria died at the turn of the century.