Can wearing contacts for years cause cataracts?

First, let me put your mind to rest that the wearing of contact lenses has nothing to do with the development of cataracts.
There are many different types of cataracts, and some of them have specific causes while others develop without ophthalmologists ever having any evidence as to why they occurred. Everyone who lives long enough will develop cataracts; some babies are born with cataracts, and others can develop them at almost any age. Fortunately, cataracts can be corrected with a painless and safe operation like cataract surgery. I suggest that you discuss your situation with your eye doctor (ophthalmologist).