<prompt> Human: Im 28 with a good job but little in the way of investments. I am maxing out my pre-tax accounts 401K and IRA. I have heard good things about Index Funds Vanguard but I am confused as to how they work. How do I pick them? Anything I should know?Assistant: Lets take a step back. What are your 401K and IRA invested in?Human: So I have a couple of 401ks from previous jobs and IRAs that I got privately. Not sure who administers any of them. Assistant: You can rollover those previous accounts so you keep track of them. But you say that youre maxing out your 401K and IRA. So what are you investing 23,500 a year right now?Human: 23500year now, but in years past the legal amount has been less. I have always been lucky enough to be able to max my tax deferred accounts. Is there a benefit other than easy tracking to rolling over the old accounts?Assistant: Youre still missing my question: what are your 401k and IRA invested in? Bonds? US stocks? International stocks? Target date fund?If you arent sure, then what companies are your 401k and IRA in?Benefits of rollovers depend on what your previous accounts are in. Its possible they have large fees and your current 401K and IRA have much lower fees.Human: Sorry. I can answer some of that. I dont know the companies I could find out, I just dont have it in front of me. I am invested in a mix of all three but mostly stocks. Maybe 20bonds, 20international.  <response>: People here will be able to help you better if you can provide which companies you hold the 401ks with you should know this, what website do you go to for balance info? Also, once at the site you should be able to view where the money is held - look for asset allocation or account summary. Look into that and will be easier to help make recommendations. 