@GailL1 I agree with your suggestion. Most folks should have a couple of years of tax returns available that will indicate their Earnings (if covered by the SS Program). I suggest this because the SS Earnings History may be a few years behind. Some employers are prompt whereas others are slow in sending data to the SSA. If folks already stopped working a few years ago, the SS Earnings History should be accurate and up to date. I can't believe anyone has 35 years of earnings records at their home.
Anyway, I and probably many others know the your intent in the last sentence, "at 8% per year". However, some folks may think that DRCs are compounding at 8% per year like an investment. DRCs do not compound. The FRA is increased by 8% and by that same dollar amount for each year that is delayed. For example, if the FRA is $1,800, the first year DRC is $144 ( $1,800 X .08). If the person has stopped working, the AIME will not change due to additional earnings. So, the next year DRC is also $144, not $155.52 ($1,944 X .08). It does not compound. The SS Benefit at that time would be $2,088 ( $1,944 + $144). The next year DRC continues at $144 and the SS Benefit would be $2,232 ($2,088 + $144). Of course, COLA, if any is additional. I think some folks believe the DRCs are compounding.