Not surprisingly it is a relatively modern circumstance that many peers would reach the age of 95. Below is a list of those who were, or might have been, at least 95 when they died. This includes only those whose age is written in Complete Peerage or Complete Baronetage in the format "aged 9_" or "aged 10_". There could well be others whose age is not specifically stated without checking the actual dates.
Peers:
Thomas Fitzwalter Bermingham, 5th Lord Athenry, is said to have died 1473, aged 90 or more
Robert Brudenell, 2nd Earl of Cardigan (5 Mar 1607-16 Jul 1703)
John de Chavent, de jure 2nd Lord Chavent, may have died 1371, aged 99
Louisa Tollemache, 7th Countess of Dysart (2 Jul 1745-22 Sep 1840)
Thomas Graham, Lord Lynedoch (19 Oct 1748-18 Dec 1843)
Charles St. Clair, 4th Lord Sinclair (30 Jul 1768-30 Sep 1863)
Baronets
Sir John Holland, of Quidenham, Bt. (Oct 1603-19 Jan 1701)
Sir Simon Every, 5th Bt. (ca 1658-12 Jan 1753)
Sir John Edward Swinburne, 6th Bt. (6 Mar 1762-26 Sep 1860)
Sir Thomas Foote, Bt., died 12 Oct 1688, said to be 96 years old. CB gives his birth as ca 1572, but they must mean ca 1592.