What is the meaning of the English word…
youth (countable noun) = the period of life associated with being young (typically between childhood and adult age)
youthful (adjective) / youthfulness (uncountable noun) = young or seeming young
1. She was an amazing volleyball player in her youth.
2. He is about 45 years old, but he’s very youthful. He runs marathons.
3. It was a time of youthfulness.