I think you should read that again. It's clear that different age groups fall for different scams and have different impacts from them.
Grandparents absolutely fall for some scams at disproportionate rates. And are less likely to be able to recover. (A 19 year old who loses everything has many more productive years to recover than a 72 year old.)
Also, humorously, millennials are starting to become grandma and grandpa. Elder millennials are in their mid 40s. It's young, but not impossible for them to be grandparents now.
