::To be fair to Jack – for every single person on this list the discrepancy can only be one day. The two day discrepancy will only arise for certain people (not all) having their 110th birthday after 29 February 2012, so it is yet to happen. But whilst we are talking about possibilities, the hypothetical person having their 110th birthday in 2013 must be three days older than a person having their 110th birthday in 1907!