The one taking at 70 (vs 62) will have missed out on (12 x 8 = ) 96 months of (lower rate) benefits.
Yep. My wife and I did the math before taking hers. And one reason we did it was that if I die before her (statistically probable), hers will be moot anyway because she’ll then get the much larger death benefit instead.
And as we all know, a dollar in the hand today is also worth more than the promise of a dollar in the hand in 15 years.