On the pages with the beer cars it says “for ages 21 & older”. However, on the page that displays the wine car, there is no statement about age. Are drinking ages different for beer and wine?
Nope. Has nothing to do with proofreading. When dealing with licensing issues, you have to follow the legal requirements stated in your license. If you have a license with a beer company and they say you have to include the age wording, then you do it. When dealing with a wine for which you need no license, there's no such requirement to include any legal text.