I've run a variety of numbers through Firecalc, and in my case at least, it doesn't seem to make much difference in success whether I take SS at 62, 70, or any year in between. I'd have to do it again to make sure nothing's changed, but I don't remember the success rate changing more than maybe 1%, at the most, from best to worst.
Now, I'm also single...maybe it would be different for a married couple? Also, while it's nothing to dismiss, SS isn't that big of a chunk of my anticipated retirement earnings.
I just pulled up my most recent statement, and it says if I take it at age 62, it would be about $1663/month, and if I wait until 70, it would be around $2998/month. So, waiting eight years gets me an additional $1335/month, but then I've had 8 years of having to spend more out of the portfolio, to make up for it.
Doesn't SS go up something like 7% for each year you delay, after age 62, until your full retirement age? And then, for every year you delay after FTR through 70, it's 8%? Well, "they" also say the stock market averages around 7-8% per year. So maybe that's why it's mostly a wash for me?
Anyway, at this point in life, I'm thinking about claiming at 62. But, I'm going to re-assess that as I get closer. I just turned 48 a couple weeks ago, so I still have 14 years to make up my mind