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The easiest way is to apply on-line (internet) at their website. I went through this recently, about 5 weeks ago and that is what I did (like you, I am also claiming at 70). I found the page to apply on-line, after a few steps it kicked me into my existing "My Social Security" account. If you don't have one you will be setting one up to make the application on-line.
See https://www.ssa.gov/benefits/forms/; page is titled "Ways to Apply"
Good luck!
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