My Dear,
Why can’t most women in your situation read the handwriting on the wall? He is more than twice your age, do you really think he will have the strength to put up with you when you are in your prime (when you’re 35 and he’ll be in his sixties)?
I suspect you’re only interested in his money; the gifts, pampering and foreign trips of a dotting old man who is just having fun.
If you make the mistake of trying to rock his family life by confronting his wife, you may just create a mean and vengeful man. I know similar situations where the man will not hesitate to sack you from your job and strip you of all the benefits of being with him so far.
Further, most women with philandering husbands are very much aware of their husband’s infidelity, but for reasons best known to them decide to ignore and put up with it. So you may not be telling her something she doesn’t already know.
Tell yourself the truth; your boss has no intention of leaving his wife for you; he is merely having his fun with you; when he gets tired, he’ll get rid of you like old news and get another lover. Besides, how are you sure you’re his only side chick? He may have others besides you.
My advice is that since you’re not getting any younger, take time to consider your situation and your future, end this relationship and give yourself a chance to find someone who is single and within your age bracket.