But, mikey4444, there's plenty of work these over 55s could do if they're not fit enough to attend fires. Very little of a firefighters job these days is actually fighting fires. Surely these over 55s could do the fire checks at offices, schools, shops etc. Then there's the talks they do when they got to schools, the older officers could easily do that too.
Besides, I think it's quite insulting to be told you're unfit for work simply because you're 55.
If they are, literally, unfit for work and cannot do the job they're employed to do, then they should be dismissed on health grounds. And have to wait until retirement age to receive their pension.