What is love? ’tis not hereafter;
Present mirth hath present laughter;
What’s to come is still unsure:
In delay there lies no plenty;
Then come kiss me, sweet and twenty,
Youth’s a stuff will not endure.

– William Shakespeare

Twelfth Night, Act 2, Scene 3. Drinking and singing with Sir Toby and Sir Andrew, Feste sings this song about the fleeting nature of love and youth. He says love is a young person’s game and it must be seized in the moment.