Kamwak, my understanding is that your wife will receive 50% of your FRA amount if she waits until her FRA to collect. That amount will only change by inflation until you die and she gets bumped up to your amount. So, ignoring inflation you will collect 1881/mo or 22,572/yr until you are 70 and she is 66. Then you will collect ((2494*50%)+1881)/mo or 37,536/yr until you die and then she would collect your 22,572/yr.
A better option, if you can afford to wait, would be to wait until you are at least 66 and she is 62 to collect. At your age 66, you would get 2494/mo or 29,928/yr and she would be eligible for a spousal benefit of (2494*50%*(1-30%))/mo or 10,475/yr for a total of 40,403/yr until you die and then she would collect 29,928/yr. The cross over point where the latter option means more money collected is only at her age 67 and your age 71, ignoring inflation.