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The verbal noun (and participial adjective) ageing (from the verb 'to age') can be seen in two different spellings: ageing in the British variety and aging in the American. The British spelling is to be preferred - not merely out of loyalty or familiarity, but because the '-e-' after the '-g-' serves to show the pronunciation - that the '-g-' is 'soft', like a '-j-'.

Compare changeable.
Don't confuse ageing (or 'aging') with agin, 
- the representation of an informal pronunciation of 'against'.

(Because agin is a colloquial pronunciation, it should not be used in academic writing.)