Wiktionary
youth-on-age
n. A perennial plant native to North America and widely planted as an ornamental: ''Tolmiea menziesii''
WordNet
youth-on-age
n. vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk [syn: pickaback plant, piggyback plant, Tolmiea menziesii]