You should gather rosebuds while you are young.
gather rosebuds
idiomTo enjoy life's immediate pleasures; to behave in a relaxed, carefree manner.
Origin
From the first line of "To the Virgins, to Make Much of Time" (inspired by Wisdom 2:8) by Robert Herrick (1591-1674): :: Gather ye rosebuds while ye may, :: Old time is still a-flying; :: And this same flower that smiles today :: Tomorrow will be dying.
Instead of worrying about his career, he decided to travel and gather rosebuds for a few months.
The poet urged his readers to gather rosebuds, reminding them that time passes quickly and youth does not last forever.