The repository contains nine quotes in the category “Growing Up.”

A man who views the world the same at fifty as he did at twenty has wasted thirty years of his life.
Muhammad Ali
1942 —

You’re only young once, but you can be immature forever.
Larry Andersen
1953 —

What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
Sigmund Freud
1856 — 1939

Teenagers are people who act like babies if they’re not treated like adults.

At twenty years of age the will reigns; at thirty the wit; at forty the judgment.
Benjamin Franklin
1706 — 1790

Growing old is mandatory; growing up is optional.

There is nothing like returning to a place that remains unchanged to find the ways in which you yourself have altered.
Nelson Mandela
1918 —

When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years.
Mark Twain
1835 — 1910

I can’t go back to yesterday, because I was a different person then.
Lewis Carroll
1832 — 1898