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
You actually start your units of measure at hours and work your way through days, weeks, and months until about 2 years. After that you’ll find people using half years (e.g., 3 and a half) until about 5-6. Then it’s just years on out from there.
Like mentioned, it’s all about speed of development and milestones so the more granule units are needed at young ages.
Even at the top end we use stuff like “late thirties” and “in the seventies” for less accurate age measurement for older people.
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