若 young

The right flower is a young flower. Old flowers are already wilted, so they're not right for this occasion.

young person ★★★☆☆ KUNKUN
若 (young) + 者 (professional) = 若者 (young person)

young person - example of the kunyomi (もの） suffix

somewhat ★☆☆☆☆
若 (young) + 干 (dry out) = 若干 (somewhat)