Youthful
Young Looking
い adjective
A young young thing has youthfulness on their side. Oh to be youthful and young looking again!
The reading is the reading you learned with the kanji. Same goes for the repeater kanji.
おばあちゃんっていつまでたっても若々しいよね。
You've really had your youthful appearance forever, grandma.
そのファッション、ちょっと若々しすぎない？
Don't you think that type of fashion is a bit too young looking for you?
東洋医学では、黒ゴマや黒ニンニク、黒米など黒い物を食べると若々しさを保てると言われています。
Oriental medicine says that eating black foods such as black sesame, black garlic, and black rice keeps us young.