I didn't FIRE early by MMM standards, but still 11 years before my employer's normal retirement age. I know we are not supposed to worry about keeping up with the Joneses, but I have to confess that one thing that concerned me was how would I feel when I eventually got to normal retirement age and my peers retired? Yes, I would have had all that time off to enjoy life, but that would be done and gone. How would I feel when they were retired too, and with so much more money than me because they'd kept working for an extra decade?
I'm now halfway through that 11 year period. I've spent less than expected and also ended up staying on 7 hours a week, fully flexible WFH, and enjoying it. I've therefore got more money than now when I FIREd. I've also suddenly realised how dumb I was in my thinking above. I assumed that my peers would be saving lots of money towards retirement in the way I did. Of course they weren't! Most of them were just contributing the minimum and spending the rest of their income. I now fully expect that I will reach normal retirement age with MORE than most of them, not less. Ridiculous.