Stop analyzing things too much and let it come and go as it is a natural thing when one wants to have sex badly. If those dreams come then what is the problem, you should enjoy those dreams and fuck her in your dream to get pleasure.
No one has a control over dreams as that is a natural thing happens with many men. As far as your desire to have sex with an older woman is concerned, you are not alone as most of the men do want to have sex with a woman who is mature and older for many reasons so you are not weird at all. Keep yourself busy and focus on something else to control yourself.
