The heart of the Euro team for the past 4-5 Ryder Cups (Westwood, Garcia, Poulter, Casey, Rose, Molinari, Donald, Stenson) is either into their 40's or close to it. Other than Rahm, Hovland & Hatton, the Euros under 30 years of age don't match up that well with the Americans in that age group.
The Americans had 6 winners of one of more majors in their line up today. Other than Dustin Johnson, Koepka was the oldest at 31 years. Of the 4 winners of majors on the Euro side, only Rahm is less than 30 years of age.