Hello Student ,

The age range of Twenties or 20s comprises of total ten years which starts from 20 and ends on 29 (i.e 20 ,21 ,22 ,23 ,24 ,25 ,26 ,27 ,28 and 29) so the age range of Twenties is 20 to 29 , similarly for Thirties or 30s it is 30 to 39.

Twenties is one of the best part of a Humans life as most of the people gets a Job(mostly early twenties) in this age range , get married (mid twenties), have kids(late twenties)  etc.

Hope this helps.