Ex-PMs Have Been Living Longer

Further to my previous post the trivia geek in me decided to find out when was the last day there were only three living occupants past or present of Number 10. The date was 10 January 1957 the day before Harold MacMillan succeeded Anthony Eden. However, for the 20 years before that there were usually only 2 or 3 men who had held the post of Prime Minister alive at any time.