This comment (and the replies) made me cringe.
"Forgive my ignorance, but how in the world does anyone save 20x their current salary? Taking the $100K/yr example and assuming a 5% matched retirement plan (so 10% of salary invested annually) and a generous 6% annual return on investments, in 30 years we'd have $791K. That's a million short of the $1,800K suggested.
I have to crank the savings up to 23% (18%+5% matched) to get to $1.8 mil in 30 years. I live well below my means and putting a fifth of my salary into investments each year still sounds pretty challenging."
"They don't. That's the simple answer. With other life issues that need acknowledgment (kids, changes in the economy, kids, student loans, kids, oh, and did I mention kids?), you probably aren't going to get anywhere near 20% of your income or whatever going to retirement until you're well into middle age. That's my experience."