I was both delighted and unsurprised that Denis Healey made it to 98. One day in the 1970s I took him to lunch at L’Epicure. As he encouraged the waiter to pile his plate higher and higher from the hors-d’oeuvre trolley, my astonishment must have been plain because he grinned and declared: ‘Don’t worry about me — both my parents lived into their nineties.’