The AWI is the one from 2023 (when you were 60), $66,621.80.
Cost of Living Adjustment
www.ssa.gov
Each prior year's contribution is factored up by the ratio of the maximum possible in 2023 ($160,200) divided by the actual contribution in that year (the maximum contributions are derived from the AWI series and then rounded off to the nearest $100). If you worked after 2023, any contribution is just used as-is, not adjusted upward.
Then you select the largest 35 years and sum up these adjusted wage indices and divide by 420 (number of months in 35 years), to get the AIME (average indexed monthly earnings).
The PIA is determined by bend point and to go into the weeds on bend points, they are determined by your AWI factor determined by the AWI for 2023 of $66,621.80 divided by the AWI in 1977 of $9779.44 to get the factor of 6.8124. You then multiply that by the 1979 first bend point (notice the 2 year offset) of $180 and round down to the next $ to get your first bend point of $1226. Similarly, the second bend point is your AWI factor x the 1979 2nd bend point of $1085 = $7391. Fortunately you don't actually have to do that bit of math, they provide a table.
Cost of Living Adjustment
www.ssa.gov
Your PIA will then be 90% of your AIME up to the 1st bend point, plus 32% of your AIME up to the 2nd bend point and 15% of whatever is greater than the 2nd bend point.
If you claim at age 62, your benefit will be 70% of your PIA.
In 2026, you will start getting COLAs.
Whew!