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Actually the operating limit for a witch is age 20, which after that a witch can no longer generate enough magic to erect a shield. So without a shield 1 hit would be fatal so they are no longer sent into combat it's a military rule.
But as long as they don't over use their magic they can have it till they are seniors.
They can still fly with a striker or broom and still use their specialty magic to a degree, like miyafuji's mother and grandmother still can use healing magic maybe not as strong as when they were younger.
Most of the time when they hit 20 or older a witch will become a instructor for the new generation. Mio still would be flying and using her magic eye if she didn't use the reppumaru sword which prematurely used all of her remaining magic so now she has none. Maybe one day it will recover just a little we will have to wait and see.
As for Yoshika it had to happen she was the main character but also she was always a special case witch, that had a level of magic that no regular witch has. Her magic level was on a whole another level that probably was the highest of any recorded witch in the strike witches universe.
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