From Longman Dictionary of Contemporary Englishbe in your twentiesbe in your twentiesto be aged between 20 and 29early/mid/late twenties She was in her early twenties when I met her. → twenty
Examples from the Corpus
be in your twenties• I felt ashamed and kept the secret, not even sharing it with Pam until we were in our twenties.• Just over half the wanted men were in their twenties.• Police say the dead man was in his twenties.• My children, Johnson says, are in their twenties and they can't handle all this swinging talk.• Above all, a pension seems so far away when you are in your twenties and thirties.• The girls and women who go there are not necessarily teenagers, some may be in their twenties and thirties.• Two men, both thought to be in their twenties, broke down the back door of his home in Bletchley. 