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1.1 > 1, so 1.1 decades old. That is how plurals work in most languages.

Yeah sure.

French for example is an exception in that fractional numbers are only pluralized over 2.

Note that in English "5 years old" would become "0.5 decades", using the plural form as well.

Your comment is about 0.000005 decades older than mine.

“Half a decade” is how I’d pronounce that.