<prompt> Human: I know diversifying is the best thing to do, but I am lost when it comes to what percentages should go where.I am 30 years old, putting 100week into my 401K through work. I dont plan on touching it until I retire a long ways down the road.Any help or advice would be appreciated! Here are my options:EDIT: Thank you everybody for the advice and input! I got the answer I was looking for.  <response>: Just throw it in Vanguard Target Retirement 2045 and be done. It should have a reasonably low expense ratio compared to the other options without you having to manage allocations and rebalancing. 