The first thing both of you need to do is open up a MySSA account at www.socialsecurity.gov and get a current Social Security Statement. At that point, you will know your projected full retirement age benefit (probably over 66), the PIA amount. Also will give you an estimate of the amount of widow/widower benefits at full retirement age. Will also tell you your full retirement age.
The benefit amount, the PIA, is determined on the lifetime earnings for you or for her, not just the marriage years. At age 60, either of you could be entitled to reduced widow/widower's benefits if the other is deceased. Earnings from jobs would affect payment.
When you are full retirement age, she will still be under full retirement age so when you retire, you have no choice about filing as her spouse. When she is full retirement age (66+), she has the choice of filing on her own or filing as a spouse only and waiting until age 70 to file on her own and get an increase in PIA due to delayed retirement credits.
The most important factor in your financial planning is the one you don't know; what is your date of death or her date of death? Only when those dates are known will you know what is the best plan for retirement dates.
Run a variety of scenarios with the various financial planning programs available. Choose different retirement dates and see how the numbers change. Figure out what you have to have in income in retirement and what you want to have (not the same). The best financial results almost all come from working as long as possible and saving as much money as possible.

