That's why I like the idea of making different classes of MOS physical difficulty, and rating the PT tests on those, no difference for sex or age, only the ability to do the job.
The problem with that it would create resentment between different units. Soldiers would look down on the less physically fit, even if they had higher rank. Also all soldiers need to be able to pick up arms and fight. The PT standards are the minium fitness level. I would hate to see us lower it even more.