What adulthood means in a society is an ocean fed by too many rivers to count. It can be legislated, but not completely. Science can advance understanding of maturity, but it can’t get us all the way there. Social norms change, people opt out of traditional roles, or are forced to take them on way too soon. You can track the trends, but trends have little bearing on what one person wants and values. Society can only define a life stage so far; individuals still have to do a lot of the defining themselves. Adulthood altogether is an Impressionist painting—if you stand far enough away, you can see a blurry picture, but if you press your nose to it, it’s millions of tiny strokes. Imperfect, irregular, but indubitably part of a greater whole.
Julie Beck writing in The Atlantic