A significant number in its own right - a number that stands in between being simply a teenager and an expectation to grow up to compare to those who are already there.
Twenty is a number that is the end of a new group of numbers and verges into a new decade, I suppose.
Watched Peter Pan and wish I would never have to grow up.
Twenty is significant in another way, in many ways and may be worth celebrating for making it thus far. It anticipates further growth as a person and maybe to an extent, expects longevity, expects no end in that growth.