Personal Finance and Investing

Total US Stock Market
Total US Bond Market
Total International or non-US Stock Market (If you want diversification)
Money Market

Those 4 investment categories should be good enough for anyone at any age who wants to keep things simple and low cost.

And since you're retired, when the stock market is down you can withdraw money from the bond or money market side. When the stock market is up, you can withdraw money from the stock side.

Only you can decide what the best asset allocation would be for your acceptable risk level and situation. Look at your expenses and life expectancy and other factors. You'd probably be getting some money from Social Security, you might have your home paid off, you might be on Medicare, etc.

Here's one example that is working for many retirees:
Total US Stock Market 40%
Total US Bond Market 30%
Total International or non-US Stock Market (If you want diversification) 20%
Money Market 10%

Here's one if you're on the All American plan:
Total US Stock Market 55%
Total US Bond Market 35%
Money Market 10%

The longer your timeline, the more stocks you should have. Shorter timeline, you need more in bonds and money market. There is some peace of mind that comes with simplicity. If you don't look at the market's ups and downs each day, you might live longer.