presenium

pre·se·ni·um

(prē-sē'nē-ŭm),
The period preceding old age.

presenium

(prē-sē′nē-ŭm) [″ + senium, old age]
The time of life that precedes old age, typically the years before age 65.

pre·se·ni·um

(prē-sē'nē-ŭm)
The period preceding old age.