old age 
noun [mass noun]
1The later part of normal life: loneliness affects many people in old age...
- All this was in complete contrast to the manner of most people in their old age.
- There will also be an incentive for people to move from England to Scotland for free personal care in their old age.
- We all know that everyone grows with a lot of features carried over from childhood to old age!
1.1The state of being old: old age itself is not a disease...
- The late Norman MacCaig once told him about old age withering his talents.
- The exhibition presents Whistler's women in the three ages of childhood, adulthood and old age.
- Most plantations are now mature and many will be felled or will deteriorate due to old age during the next decade.
- asymmetric
- asymmetrical
- asymmetrical conflict
- asymmetrically
- asymmetrical warfare
- asymmetric bars
- asymmetric conflict
- asymmetric warfare
- asymmetry
- asymptomatic
- asymptote
- asymptotic
- asymptotically
- asynchronous
- asynchronously
- asynchronous transfer mode
- asynchrony
- asyndetic
- asyndeton
- as you do
- asystole
- asystolic
- (as) —— as all get out
- (as) —— as anything
- (as) —— as hell