youth-and-old-age

American  

[yooth-uhn-ohld-eyj, -uhnd] / ˈjuθ ənˌoʊldˈeɪdʒ, -ənd /

noun

1. a stiff-growing, erect composite plant, Zinnia elegans, of Mexico, having large, solitary flowers with yellow-to-purple disks and usually red rays.

---

Etymology

Origin of youth-and-old-age

An Americanism dating back to 1890–95