Earlier quoted context omitted.
I could understand smaller age ranges for younger folks because they’re developing at a more rapid pace. For example 30-40 age range would group together people with relatively similar life experiences, but a 10-20 age range would not.
Sure, but this is a forum for entrepreneurs and software engineers, it does not target the world demographic. To be honest, I don't understand what "they develop faster" means either. One year of age is objectively the same length whether you're 10 or 90. What has growth speed and brain development got to do with anything?
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.