Your wife will get her benefit based on her income levels during the years she worked. It has nothing to do with your SSD. Once you turn 65, your SSD will convert to a regular Social Security benefit.
If you die first, your wife will get either her benefit or your benefit, whichever is higher. If your wife dies first, then you either can get her benefit or keep your benefit, whichever is higher. You can not collect both once one spouse has died.