There's very few people in the world that can maintain 47 years of uninterrupted discipline. Most people hit one or a number of:

- A significant health issue that also drains them economically

- A broken marriage that cuts their savings in half (or less)

- A low point in their life where saving for retirement just doesn't make sense in their heads anymore because they feel they'd rather die tomorrow.

- A streak of bad events longer than they planned for (the car breaks down, they got fired and their mother-in-law needs financial assistance all at the same time)

- Etc, etc...

The point is: nobody is retiring a millionare through the process you described. Either you save signfiicantly more at certain points (because you earn more) and get lucky enough with the above where you make it there, or you don't retire a millionare even after having saved consistently for many periods in your life.