I was born ... year(s) ago.

Indicates that the speaker is aged twenty.

A century egg (Chinese egg dish)

(idiomatic, anime and manga fandom slang) To be so immature and unprepared as to have no hope of achieving an accomplishment.

plural of thousand-year-old egg

Used to emphasize the annual distinctiveness of Christmas, especially in contexts where either the special joys or tribulations of the holiday are described.

Particularly wise for one's age group; wiser than most others of one's age.

I am going to recreate/reinvent myself for the new year

plural of disability-adjusted life year

(medicine) A measure of overall disease burden, expressed as the number of years lost due to ill-health, disability or early death.