"ageing" in the noun sense
1. ripening, aging, ageing
acquiring desirable qualities by being left undisturbed for some time
2. aging, ageing, senescence
the organic process of growing older and showing the effects of increasing age
"ageing" in the verb sense
begin to seem older get older
"The death of his wife caused him to age fast"
2. senesce, age, get on, mature, maturate
grow old or older
"She aged gracefully"
"we age every day
"The death of his child aged him tremendously"
"ageing" in the adjective sense
1. aging, ageing, senescent
Source: WordNet® (An amazing lexical database of English)
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