At what age can you become a real estate agent?

In most states (definitely in Missouri & Kansas, where I am licensed) you only have to be 18 to be an agent. However, my opinion is that you should wait until you've gained a good network of home-buying/home-selling age acquaintences. I got my license at 22, right out of college, and I didn't know anyone who had enough money to buy a house, let alone anyone who wanted to sell theirs. It's certainly possible to get referrals and overflow business, depending on your brokerage policies and willingness to give new agents business. However, it's a LOT harder to do it this way. These warnings are really only applicable if you're wanting to go into real estate full time, right now. Real estate is one of the least expensive fields to go into, since licensing and training is relatively inexpensive. It's something great to have on your resume, and can lead to other opportunities. Additionally, it's a very convenient part-time job since so much of the business occurs on evenings and weekends.