re: What to do with 2 Old 401K accounts from previous employers

Just roll them into a Roth or Traditional IRA with fidelity (which one is best for you really depends on your income and if you think you'll be in a higer or lower tax bracket when you retire). Then, if you still have like 20 years to retire invest it in FXAIX which is Fidelity's S&P 500 index fund.

When you get closer to retirement, like 10-15 years, you'll want to start diversifying it more into more Bonds, Cds, ect and less stock. But would be best to use an advisor or do more research then. But until then that's what going to be best for you and that's what everyone on here is gonna tell you to do. Or stick it in VOO which almost the same thing, but is an ETF S&P 500 follower.

If you don't have a 401k with your new employer, you're probably going to want to start an IRA anyway to contribute to.