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Graduated classification is used as the number of aged population in each subzone was not identical, making it not suitable to use categorised as our tool of classification. Graduated was more relevant in this case as it spreads out over a range of values.

The lighter shade of blue means less number of aged population, regardless of how large or small the total population is in that subzone. Some areas in the east had larger number of aged population, such Bedok and Tampines. Areas that had a lower number of aged populations are closer to the coast of the island and non-residential districts like catchment areas.