青春具體的年齡段是從幾歲到幾歲？

青春是指青年時代壯麗的時光，但是青春的具體年齡段是從幾歲到幾歲，一般超過了幾歲就等於過了青春期了？

新東方的背誦美文裡面有一篇「youth」

Youth is not a time of life; it is a state of mind; it
is not a matter of rosy cheeks, red lips and supple knees; it is a matter of
the will, a quality of the imagination, a vigor of the emotions; it is the
freshness of the deep springs of life.

Youth means a temperamental predominance of courage
over timidity, of the appetite for adventure over the love of ease. This often
exists in a man of 60 more than a boy of 20. Nobody grows old merely by a
number of years. We grow old by deserting our ideals.

Years may wrinkle the skin, but to give up enthusiasm
wrinkles the soul. Worry, fear, self-distrust bows the heart and turns the
spirit back to dust.

Whether 60 or 16, there is in every human being』s
heart the lure of wonders, the unfailing appetite for what』s next and the joy
of the game of living. In the center of your heart and my heart, there is a
wireless station; so long as it receives messages of beauty, hope, courage and
power from man and from the infinite, so long as you are young.

When your aerials are down, and your spirit is covered
with snows of cynicism and the ice of pessimism, then you』ve grown old, even at
20; but as long as your aerials are up, to catch waves of optimism, there』s
hope you may die young at 80.

還有夢想，還有希望。