I am leaning towards 62-64 at this time (56). My wife is eligible for the spousal amount (50% of mine at 66.5). So....the longer I wait the more she will get as well. I don't know how to figure out the difference (of how much she gets) year to year so I will have to sit down and see if I can come up with the numbers at some point.
If she waits for FRA, then she gets half of your amount at FRA. Does not matter when you take your SS as long as you have filed and she is FRA. If you continue to work the only way it affects her spousal amount is if your current wages increases the 35 year average total they use to figure your FRA amount. If she files for benefits before she reaches FRA, it will affect her amount.
from Soc Sec web site
A spouse can choose to retire as early as age 62, but doing so may result in a benefit as little as 32.5 percent of the worker's primary insurance amount. A spousal benefit is reduced 25/36 of one percent for each month before normal retirement age, up to 36 months. If the number of months exceeds 36, then the benefit is further reduced 5/12 of one percent per month.
For a spouse who is not entitled to benefits on his or her own earnings record, this reduction factor is applied to the base spousal benefit, which is 50 percent of the worker's primary insurance amount. For example, if the worker's primary insurance amount is $1,600 and the worker's spouse chooses to begin receiving benefits 36 months before his or her normal retirement age, we first take 50 percent of $1,600 to get an $800 base spousal benefit. Then we compute the reduction factor, which is 36 times 25/36 of one percent, or 25 percent. Applying a 25 percent reduction to the $800 amount gives a spousal benefit of $600. Thus, in this case, the final spousal benefit is 37.5 percent of the primary insurance amount.