Mr. Money Mustache is the website and pseudonym of 44-year-old, Canadian-born blogger Peter Adeney. Adeney retired from his job as a software engineer in 2005 at age 30 by spending only a small percentage of his annual salary and consistently investing the remainder, primarily in stock market index funds . Adeney lives in Longmont, Colorado , and contends that most middle-class individuals can and should spend less money and own fewer physical possessions, and that they can live with increased financial freedom and happiness as well as a decreased environmental footprint as a result. He has described the typical middle-class lifestyle as "an exploding volcano of wastefulness," particularly citing the overuse of and overspending on new cars as an example. The blog has been featured and cited in various media outlets including Market Watch , CBS News , and The New Yorker , as well as others.