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As a 22-year-old, how risky should I be with my 401(k) investments?
+1 on all the answers above. You're in a great position and have the right attitude. A good book on the subject is A Random Walk Down Wall Street - well worth a read. Essentially, go for low tax paying in, low tax taking out approach (in the uk that's a SIPP or ISA), a low cost well diversified unit fund (like a Vanguard LifeStrategy 100), on a low cost platform ("Annual Management Charge" in be UK). Keep paying a regular amount and let compound interest take care of things. I'd also add that you should think about what lifestyle you would want at specific ages and work out what you need to save to achieve these - even though they are probably a long time in the future, it makes your goals "real". Read Mr Money Moustache for some ideas http://www.mrmoneymustache.com