Related:

• As is the bud bit with an envious worm Ere he can spread his sweet leaves to the air, Or dedicate his beauty to the sun.
  -- William Shakespeare (1564-1616), Romeo and Juliet -- Act i, Sc. 1...
• Crabbed age and youth Cannot live together.
  -- William Shakespeare (1564-1616), Sonnets & other Poetry -- The Passionate Pilgrim, viii...
• Forty is the old age of youth; fifty is the youth of old age. -- Victor Hugo
• His head, Not yet by time completely silver'd o'er, Bespoke him past the bounds of freakish youth, But strong for service still, and unimpair'd.
  -- William Cowper (1731-1800) -- The Task, Book ii, The Timepiece, Line 702...
• What is learned in youth is understood in age.
• I would not enter on my list of friends (Though graced with polish'd manners and fine sense, Yet wanting sensibility) the man Who needlessly sets foot upon a worm.
  -- William Cowper (1731-1800) -- The Task, Book vi, Winter Walk at Noon, Line 560...
• The arrogance of age must submit to be taught by youth.
• What youth deemed crystal, age finds was dew.