Comment by sph

> 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.

> One year of age is objectively the same length whether you're 10 or 90.

A 20yo is 100% older than a 10yo. But a 90yo is only 12.5% older than an 80yo.

The older we get, the closer in age we become.

> this is a forum for entrepreneurs and software engineers

While the demographics certainly skew in that direction, one of the nice things about HN is that it's not just software people. While I certainly comment more on software-related matters because that's where my expertise is, the largest value I get out of HN is from non-software/IT stories and the comments on those.

So I would strongly disagree with "this is a forum for entrepreneurs and software engineers". I'd probably stop coming here if that was the case.