youthful

/ˈjuːθfl ‍ˈयूथ़्‌फ़्‌ल्‌/ adj.

1 typical of young people युवकोचित, जवानों जैसा

youthful enthusiasm

2 seeming younger than you are तरुणवत, जवान-सा, यौवनसंपन्‍न (अपनी वास्‍तविक आयु से छोटा लगने वाला)

She’s a youthful fifty-year-old.