He is 25, and he plans to retire at 30, in 5 years he may save another couple thousands more.
Let's put on the lower part of the "couple" spectrum and say he have 200.000, in 5 years he will have 400.000 USD. This money is enough to retire early with the 4% rule http://www.mrmoneymustache.com/2012/05/29/how-much-do-i-need...
Maybe you are assuming that he want to live in the states, with the interest of this money he could live easily in Spain, Thailand, Argentina, etc...
It can be [1]. Instead of saving 10-15% of your income, suppose you cut your expenses drastically and started saving 80% of your income. The math works out that you will be financially independent within 5-7 years and no longer have a requirement to work for money.
Maybe you are assuming that he want to live in the states, with the interest of this money he could live easily in Spain, Thailand, Argentina, etc...