Born the son of Captain Fenton John Aylmer (24 December 1835 – 9 April 1862) and Isabella Eleanor Darling (died 27 December 1908). Aylmer attended the Royal Military Academy, Woolwich, as a Gentleman Cadet and was promoted Lieutenant on 27 July 1880. He took part in the Burma expedition between 1886 and 1887.
Born the son of Captain Fenton John Aylmer (24 December 1835 – 9 April 1862) and Isabella Eleanor Darling (died 27 December 1908). Aylmer attended the Royal Military Academy, Woolwich, as a Gentleman Cadet and was promoted Lieutenant on 27 July 1880. He took part in the Burma expedition between 1886 and 1887.