| juvenescence | (noun) the process of growing into a youth | - |
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| juvenile | (noun) a young person, not fully developed | Synonyms: juvenile person |
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| juvenility | (noun) the freshness and vitality characteristic of a young person | Synonyms: youth, youthfulness |
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| (noun) lacking and evidencing lack of experience of life | Synonyms: callowness, jejuneness |
| rejuvenation | (noun) the act of restoring to a more youthful condition | - |
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| (noun) the phenomenon of vitality and freshness being restored | Synonyms: greening |
| rejuvenescence | (noun) A renewal of youthful characteristics or vitality. | - |
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