The 4% swr is based on a 30 year retirement time frame …. Starting at 70 would be a different calculation totally.
planning from 70 to 92 instead of 62 to 92 shows a safe withdrawal rate would be considered to be 4.80% and not 4%.
the later you start the higher the safe withdrawal rate is and the earlier you start the lower it is
1,000,000 in a 50/50 4.80% draw rate
FIRECalc looked at the 129 possible 22 year periods in the available data, starting with a portfolio of $1,000,000 and spending your specified amounts each year thereafter.
Here is how your portfolio would have fared in each of the 129 cycles. The lowest and highest portfolio balance at the end of your retirement was $-160,274 to $2,979,685, with an average at the end of $860,548 . (Note: this is looking at all the possible periods; values are in terms of the dollars as of the beginning of the retirement period for each cycle.)
For our purposes, failure means the portfolio was depleted before the end of the 22 years. FIRECalc found that 9 cycles failed, for a success rate of 93.1%.