Libellus Rogerii Baconi Angli doctissimi mathematici et medici, De retardandis senectutis accidentibus et de sensibus conservandis.... opera Johannis Williams Oxoniensis.

Translated into English by Richard Browne as The cure of old age and preservation of youth by Roger Bacon, a Franciscan frier (London, 1683). Digital facsimile of the 1683 edition from the Internet Archive at this link.