Yes, you can! As long as you have earned income and don't earn more than the maximum modified adjusted gross income limit, you can contribute to a Roth IRA. Roth IRAs don't carry the same minimum required distribution rule that traditional IRAs do so you can let the account grow indefinitely if you choose. In order to withdraw earnings tax-free, you'll just need to make sure you're over the age of 59 1/2 (which you will be) and the account is open at least five years.