counting by fives and tens

I've noticed that people either count by fives or by tens — and the older you are the more likely you are to count by tens.

for instance, if you count by fives, that you think a 26-year-old is "25" … but if you count by tens then she is "30".   people will lump you into an age cohort group that might be fine (5 years) or large (ten years).  

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