Another thing to mention is that if you were born on or before January 1, 1954, you can apply for your spousal benefits and let your own benefit grow, a strategy known as restricted application. For example, if your spouse has reached Full Retirement Age (FRA), spouse files for their benefit of $500 and you can collect spousal benefits of $250. When you reach 70, you can switch to your benefit which will have increased to 132%, which means you will collect $2640 per month instead of $2000 per month and your spouse can switch to their spousal benefit of $1000. Also, if you do that strategy, your survivor benefit for your spouse will be the higher $2640 instead of $2000. The breakeven point will be around 85 years and since there are greater than 50% odds that one of you will live to be 90 or older, it is certainly something to consider.
Best of luck!