Adolescence /ˌæd

cycle /ˈsaɪ.kl ̩/ noun SERIES
2. [ C ] a group of events which happen in a particular order, one following the other, and which are often repeated the life cycle of a moth
3. [ C ] one in a series of movements that a machine performs the spin cycle
demographics /ˌdem.əˈgræf.ɪks/ plural noun
the quantity and characteristics of the people who live in a particular area, especially in relation to their age, how much money they have and what they spend it on
The demographics of the country have changed dramatically in recent years.
No one has exact demographics on (= information about the quantity and characteristics of the people who live in) the area.
development /dɪˈvel.əp.mənt/ noun GROWTH
1. [ U ] when someone or something grows or changes and becomes more advanced
healthy growth and development
The programme traced the development of popular music through the ages.
The region suffers from under-/over-development (= having too little/much industry) .
a development project (= one to help improve industry) in Pakistan
diversity /d a  ɪˈvɜː.sɪ.ti/ /dɪˈvɝː.sə.t ̬i/ noun [ S or U ]
when many different types of things or people are included in something
Does television adequately reflect the ethnic and cultural diversity of the country?
There is a wide diversity of opinion on the question of unilateral disarmament.