37 years old
Mozart never wrote Happy Birthday. However, he did write a similar tune to "Twinkle Twinkle Little Star" when he was five.
Mozart was five when he composed his first piece.
Mozart's Andante in C was written when he was 4 or 5; evidence is inconlusive.
He was 5 yrs old when he composed his first piece of music!
Mozart when he was 5 years old (really!)
the happy by song was made in 1893
The actual "day" is not known ... and Mozart is dead! He was about 4 years old when he composed his first work.
Wolfgang Amadeus Mozart (1756. - 1791.) composed his first piecefor harpsichord. It was Andante in C (KV 1a). It is an extremely short piece, consisting of just 10 measures, and it was notated by Leopold Mozart, his father. Wolfgang was only five years old when he composed this piece of music.
49 Happy Birthday
The Mesopotaminans sing happy birthday sometimes. In Mesopotamia, people used very old candles.
Most historians believe he composed his first works at age 5 or 6.Initially Mozart wrote simple songs (contrary to popular belief, he did not compose the music to Twinkle Twinkle Little Star), but at the age of six he did indeed write his first sonata, the Violin and Keyboard in C major K. 6.
In the old Christmas specials that aired every year, Frosty would say, "Happy Birthday!" each time he came to life.