Answer
(Fatwa: 710/702=D)
You hurried in performing marriage, did not investigate the matter thoroughly and believed the assurance of the girl. She cheated you and you decided to marry her hastily while you were ordered by Hadith to do consultation and istikharah before marriage. However, when the nikah took place and she became your wife then it is necessary upon both of you to behave with good conduct to each other; it is wrong to even think of separation without any sharai reason. Only being older in age is not a defect. When the Prophet (Sallallahu Alaihi Wasallam) married Hazrat Khadeeja he was only 25 while she was 40. However, if you dislike it you try to deal with it considering it as decision of Allah, in-sha-Allah you will get reward. And, if there is really any defect or fault then take a step only after consulting elders of your family.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband