1. Growing old
   "Many techniques have been used to isolate aging red cells";
   - ageing, senescent

1. The organic process of growing older and showing the effects of increasing age
   "The study focused on the effects of aging on cognitive function";
   - ageing, senescence
    
2. Acquiring desirable qualities by being left undisturbed for some time
   "The aging of wine improves its taste";
   - ripening, ageing

1. Grow old or older
   "She aged gracefully"; "we age every day — what a depressing thought!";
   - senesce, get on, mature, maturate
    
2. Begin to seem older; get older
   "The death of his wife caused him to age fast"
    
3. Make older
   "The death of his child aged him tremendously"
    
4. Cause to ripen or develop fully
   "Age matures a good wine";
   - ripen, mature

Derived forms: agings

See also: old

Type of: alter, biological process, change, develop, modify, organic process

Antonym: rejuvenate

Encyclopedia: Aging