if you are talking about your boss specifically or if you are working with a sole employer you say employed by. If you are talking about a business as a whole you say employed at.
I would think not at 90 years old I would say he needs a break!!!!
The correct way is, "different from yours".
Different 'from' is grammatically correct.Different 'from' is correct.
it is still coma but it is different to say
The correct way is, "His shirt is different frommine"
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Different from is correct. Consider saying 'This marble differs FROM this marble' and apply it to different. 'Different than' is an Americanism. However, it's preferable to the heinous 'different to', which has become commonplace in Britain.
Different from is correct. Different than is not correct, although it is very common The mistake is made by analogy with the comparative form, which does use than. We say, for example, these books are different from one another; the first one is bigger than the second.
We can say that, politics then is different from the politics now, because, politics then was less democratic than politics now.
Bichon frise. No different than English