Real men have the letter "r" in their name

When did this:

Liam     Jayden     Aiden     Mason

Become more attractive than this:

Elmer     Willard     Fred     Harold

When did this:

Ava     Isabella     Lily     Sophia

Become more beautiful than this:

Gertrude     Mildred     Opal     Beulah

Source: http://fivethirtyeight.com/features/how-to-tell-someones-age-when-all-you-know-is-her-name/