Beer for Kids?

I am puzzled by this mid-1800s ad for Rainier Beer, suggesting that its consumption by children and senior citizens is beneficial. I thought maybe it was a root beer, as this popular soda was considered a cure-all in older days. But Rainier has been a beer brewery since 1884. Beer was thought to be safer to drink then because water was often contaminated. And I've heard that doctors once told pregnant women to drink beer... Still not sure if beer consumption by pregnant women or children was common then.