The oldest in my direct line (indeed, the oldest in my whole tree) is Angus MacGregor of Caithness, who was 106 in the 1841 Scotland census.
The Times newspaper ran a short feature on him on 20 May 1840, sourced from the John O'Groats Journal:
There is at present residing near DONBEATH a pensioner named
ANGUS MACGREGOR, who was discharged from the Army in 1785, in consequence of
a hurt in his leg. He was then 50 years of age, and is consequently now in
his 105th year. During the French war this veteran had again to "buckle on
his armour", and though incapacitated by his wound from taking the field,
served his country in garrison for upwards of 15 years more. MacGregor is a
native of the parish of LATHERON, and has resided there since his final
discharge. Although this "relic of the wars" is now unable to travel to
Wick, "to fight his battles o'er again" among the veteran campaigners which a
pension-day is sure to muster, yet he still leaves his bed, and marches to
his station by the fireside with accustomed regularity. Although rather
oblivious, as Dominie Sampson says, of matters of recent occurrence, his
reminiscenses of the "days of other years" are quite vivid. --
I don't know when he died, but unsurprisingly he does not appear in any census after 1841.
Anna