na-adjective
youthful; young-looking; fresh
Describes a person, appearance, or atmosphere that seems young, fresh, or full of youthful energy. Often used for someone who looks younger than their age.
彼女はいつまでも若やかで、年齢を感じさせない。
She remains youthful no matter how much time passes, and you wouldn't guess her age.
その色合いが部屋を若やかな印象にしている。
That color scheme gives the room a fresh, youthful feel.