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"Ageing" is the correct spelling in British English. In American English, it is spelled "aging."
both have same meaning,the process of growing old , but aging(US,AUS) ageing(UK,INDIA)
aging
The four different types of aging are chronological aging (natural process of getting older), intrinsic aging (internal factors like genetics), extrinsic aging (external factors like sun exposure), and cellular aging (damage to cells over time).
gerontology is the study of aging gerontologist is the person who studies it