Some stats I found..not the most up to date however
1: www.publications.parliament.uk/pa/cm200405/cmhansrd/vo050407/text/50407w10.htm
Extract: "As part of the demographic assumptions associated with the periodic valuations of the Teachers' Pension Scheme, the Government Actuary takes into account the life expectancy of teachers following their retirement. In the latest valuation report at 31 March 2001 the assumed life expectancy of teachers in normal health at age 60 was 26 years for men and 29 years for women. At age 65, assumed life expectancy would be about five years less than at age 60. The Government Actuary will be taking account of any subsequent improvements in life expectancy as part of the current valuation of the scheme."
Also this: www.telegraph.co.uk/news/uknews/1567252/Why-accountants-live-longer-than-builders.html
Teachers are included here with comparable occupations e.g. managers, journalists. OK, it's an average, which can be misleading but if teachers were so far out of line from other occupations I imagine that would have been highlighted, as would the Minister's answer in the Commons.
I take issue (a little) with what seems to be an automatic assumption that people in their sixties cannot handle pressure, stress or are physically too taxed.
I have just retired - by choice and for more time to pursue hobbies and voluntary work, not because of health issues - at 68. My occupation involved a lot of international travel, a lot of stress and deadlines (including dealing with 24-hour media) a lot of responsibility and the need to assimilate difficult scientific and medical concepts very fast. My working week at pressure times ran to 90 hours and was rarely less than 45 (I was self-employed so no EU directives to hamper me).
OK there are certain occupations e.g. active duty in the armed forces, which would not be feasible, but I think you would find that a reasonable proportion of teachers in their sixties are well able to deal with the demands of the job.