According to Wikipedia, "there is uncertainty regarding the year and day of [Purcell's] birth. No record of baptism has been found. The year 1659 is based on Purcell's memorial tablet in Westminster Abbey and the frontispiece of his Sonnata's of III. Parts (London, 1683). The day 10 September is based on vague inscriptions in the manuscript GB–Cfm 88. It may also be relevant that he was appointed to his first salaried post on 10 September 1677, which would have been his eighteenth birthday."
If asking the age at which he died, in a quiz, it would be fair to accept either 35 or 36.
© Haydn Thompson 2021