Some interesting stats from that calculator:
90% percentile cutoff at age 65 is $2,433,000 (Wow! So 10% of 65-year olds have more than $2.4MM? Wow.)
90% percentile cutoff at age 66 is $1,453,300 (Again wow! Lot of seniors living it up during their first year of retirement! To the tune of $1MM vacations and exotic cars)
90% percentile cutoff at age 67 is $1,780,301 (Phew, those seniors have finally stopped partying and started saving again!)
90% percentile cutoff at age 68 is $1,566,620 (Okay)
90% percentile cutoff at age 69 is $2,440,000 (Wow! Let me in on whatever those 68-year olds invested in last year!)
90% percentile cutoff at age 70 is $1,402,400 (Easy come, easy go)
You'd expect the distribution curve to be much smoother. Such wild jumps seem to indicate a very small sample size.