1. a time of life (usually defined in years) at which some particular qualification or power arises

e.g. she was now of school age
tall for his eld

Synonym: age

2. a late time of life

e.g. old age is not for sissies
he's showing his years
age hasn't slowed him down at all
a beard white with eld
on the brink of geezerhood

Synonym: old ageyearsagegeezerhood