For a generation currently in the 25-30 range, having ~$5 million in a retirement account at age 65/70 will be "way into the 1%"? Putting 12-15% of salary into

For a generation currently in the 25-30 range, having ~$5 million in a retirement account at age 65/70 will be "way into the 1%"? Putting 12-15% of salary into a 401k plan for 40 years would seem to get you into that range.