For example we refer to infants over a year as 13 months, 16 months, 24 months, etc. Is there a reason for this convention?
In: Biology
All of the answers so far are great, but there’s a simpler, non-biological way of looking at things.
When you have very little, every bit counts. When you have a lot, the smaller pieces aren’t so significant.
0.1 is one five hundredth of fifty, one fiftieth of five, but a tenth of one and one hundred percent of 0.1. When a twenty year old is a month older, they’re very slightly older. When a one month old is a month older, they’ve literally doubled their age. Turning one is a milestone, sure, but you’re still working with small numbers. The fractions are still a significant proportion of the whole.
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