Nonsense. Doing the job, whatever that may be, is the only factor that matters.
If a 54 year old is expected to do the same job in the same conditions as someone far younger then the test should be the same. That goes whichever their gender.
When I leave I'll be glad to leave all you gym queens behind, your attitude is part of the unimaginative line-toeing that makes H.M. forces such a joyless dirge these days.