The "Happy Birthday" song is the most recognized song in the English language, followed by "For He's a Jolly Good Fellow".

The tradition of putting candles on birthday cakes dates back to Ancient Greece when people brought cakes adorned with lit candles to the temple of Artemis.

The world's largest birthday cake weighed 128,238 pounds and was made in 1989 at the Fort Payne Bakery in Alabama.

The most common birth month is September, with the most common birthday falling between September 9-20.

In many cultures, pulling on the earlobes once for each year of life is a birthday tradition.