MS007, first, unless there has been a very recent change, KSS is not a MSC; they merely schedule work. IF there were specific age requirements, that would be the client's condition.
Secondly, your comment concerning applying for less desirable shops is, in my opinion, excellent. According to my philosophy, it is better to try and fail, than to wonder "what if?"
Finally, in this work, age exclusion is a fact; I am 82 and encounter that situation. I completely understand the client's interest in targeting whom they desire. After all, this IS still business!