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When should I start saving/investing for my retirement?
My basic rule I tell everyone who will listen is to always live like you're a college student - if you could make it on $20k a year, when you get your first "real" job at $40k (eg), put all the rest into savings to start (401(k), IRA, etc). Gradually increase your lifestyle expenses after you hit major savings goals (3+ month emergency fund, house down payment, etc). Any time you get a raise, start by socking it all into your employer's 401(k) or similar. And repeat the above advice.