Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
youth-on-age is a noun meaning "vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk". It carries one recorded sense.
vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk
Definitions, synonyms and semantic relations for youth-on-age come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.