<prompt> Human: If I am just lazy and do not want to bother with finding individual funds, what do I stand to lose investing 5,500 per year via Roth IRA in Vanguard Target Date Funds? i.e., Target Retirement 2055 -If I have been doing this from 18 until I retire at 59 12, will I stand to lose money had I went with a lazy 3 fund port instead? From my understanding, I stand to have 1.5M by 59 12 if I put in 5000 per year and just let compounding work its magic.-Am I wrong here?  <response>: 1. Its really good to use a target date fund, puts you ahead of 99 of US population if you max it as you say.2. Target date funds have higher fees expense ratio than just investing in a lazy 3 fund yourself. So yes its not 100 optimal to use target dates. 