Felix Aylmer was born in Corsham, Wiltshire, the son of Lilian (Cookworthy) and Lieutenant-Colonel Thomas Edward Aylmer Jones. He was educated at King James’s Grammar School, Almondbury, near Huddersfield, where he was a boarder from 1897 to 1900, Magdalen College School, and Exeter College, Oxford, where he was a member of Oxford University Dramatic Society (OUDS). He trained under the Victorian-era actress and director Rosina Filippi before securing his first professional engagement at the London Coliseum in 1911. He appeared in the world premiere of The Farmer’s Wife by Eden Phillpotts at the Birmingham Repertory Theatre in 1917. Between 1917 and 1919 he served as a junior officer in the Royal Naval Volunteer Reserve (R.N.V.R.).

Aylmer was President of Equity from 1950 to 1969. He was made an Officer of the Order of the British Empire in the 1950 King’s Birthday Honours and knighted in the 1965 Queen’s Birthday Honours.

At the age of 80 Felix Aylmer played a villain in an episode of Randall and Hopkirk (Deceased) entitled “It’s Supposed to be Thicker than Water”. His last major screen role was as the Abbot in the sitcom Oh, Brother!, opposite Derek Nimmo (1968–70). He appeared as a doctor in an episode of the TV series Jason King called “If It’s Got To Go, It’s Got To Go” in 1972, at the age of 83. Aylmer died in a nursing home, aged 90, in Pyrford, Surrey in 1979.