Comment by awb

> To be honest, I don't understand what "they develop faster" means either.

Maybe there’s a better way of phrasing it, but I mean the rate of change is faster when you’re younger.

A 10yo will have very different preferences, life experiences, brain development, etc. compared to a 20yo (10y apart). Yet a 30yo and a 40yo (also 10y apart) will be fairly similar in these categories on average.

Because at 10yo the body and brain are changing more rapidly than they would be at middle age.

So if you were doing any kind of marketing or social science report based primarily on age, you’d typically want narrower age bands at lower age ranges and higher age bands at middle and older ages in order to create the most homogeneous groups.