Let's get real: best way to date Irish men?
It’s tricky but I’ll help as best I can!
If you’re standing close enough to them you might be able to glimpse their neck. This is where their expiry dates are printed so if you get in a little closer you should be able to see their date of manufacture, too.
Failing this, you could bring him on a day out to a museum and compare him to the contents of the archeology section.