YOUTHFUL

[adjective] approvingYouthful means having the qualities that are typical of young people.At the time I admired his youthful enthusiasm/vigour.She has very youthful skin.He's a very youthful-looking 60 - I thought he was more like 50.(approving) Youthful can also just mean young.A youthful president can be good for a country's morale.