[Info taked from 'Shock To The System' by Mark Putterford]

Angus’s year of birth was publicized as 1959 to play into the schoolboy image. This would have made him 15 years old when the band formed in 1974. However, his real year of birth is 1955. He did leave school at the age of 15, but didn’t join AC/DC until 1973, when he was 18.