aging (Adjective) — Growing old. ex. "Many techniques have been used to isolate aging red cells"
aging (Noun) — Acquiring desirable qualities by being left undisturbed for some time.
aging (Noun) — The organic process of growing older and showing the effects of increasing age.
aging (Verb) — Begin to seem older; get older. ex. "The death of his wife caused him to age fast"
aging (Verb) — Grow old or older. ex. "She aged gracefully" ex. "we age every day--what a depressing thought!"
aging (Verb) — Make older. ex. "The death of his child aged him tremendously"
aging (Verb) — Cause to ripen or develop fully. ex. "Age matures a good wine"