Both are correct, but it's "four and a half year old" (year in the singular, because here it's used as an adjective). The first way of saying it being shorter, I think it's more commonly used.
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PieanneBoth are correct, but it's "four and a half year old" (year in the singular, because here it's used as an adjective)
Wrong. You say either "this kid is four and a half years old" or this is a "four and a half year old kid" (no s).
MowgliMy son is four and half?Dear Mowgli,