'However I will not teach past 60 as evidence shows it reduces your life expectancy.'
Then start saving and investing to support yourself to 66, 67, what have you, because the world's not going to be able to do it just because you don't want to lower your life expectancy, had a hard job, don't fancy working anymore, etc.
Tough.
That's how it goes.
My FIL worked manual jobs since he was 14 in the private sector. Hard, on his feet, heavy lifting, etc. He just retired and he's 65. That's the age at which he could draw pension. His health is shot.
But teachers are different and should put their feet up an extra five years or more because they're them.
Sorry, but you're not going to get much sympathy from our childrens' generation with that.
The world's getting harder and harder.
Deal with it or check out.