How to retire at 50

Here is the link.

well-written article. I like to take some notes.

Assuming a hypothetical, though historically reasonable 7% annual rate of return on an investment, a 25 year-old who manages to put $20,000 away every year will end up with almost $1.38 million by age 50. Put in that same $20,000 beginning at age 35, and she’ll only end up with $531,000 by 50. In fact, in order for that 35 year-old to end up with the identical $1.38 million by 50, she’d have to put away more than $50,000 a year to catch up to the early bird who started at 25.