Error message does not specify that we cannot add decimal places to the ages

[shavonneg]

1. Add a new user using add n\John Doe p\88888888 e\johndoe@mail.com i\T0123456A ag\12.5 s\M a\John street, block 123, #01-01

Expected: Error message should specify that we cannot add decimal places to the ages instead of it being non-negative.

Actual: Error message does not contain this detail.

[soc-pe-bot]

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