FreeBMD: While there are two FreeBMD entries with a different age (almost certainly duplicates), 76 appears to be the correct one based on the below parish register.
ACTON Edward Birt, death at 70, registered at Lambeth (v. 1d, p. 349)
ACTON Edward Birt, death at 76, registered at Lambeth (v. 1d, p. 349)