[compcoffee]

>Median takes away the bias of the extremes that averages can include.

What sort of extremes do you expect to see in age data for starting a business?

There will be no 10 years olds, and likely no 90 years olds.

>But in this "research", there are far more data to unpack.

Why the quotations? Do you not believe this is research? This is a 1000 word summary of their work; do you think these researchers, from some of the best schools on the planet, didn't consider the sorts of questions you pose?