Hello Josue,
I use FB ads for targeting the ideal buyer or seller but you need to understand the type of buyer or seller you are trying to attract in a particular neighborhood. You can target under the "finance section" for possible first time buyers, just engaged, salary, net worth, or having a baby. Yes target different age groups too.
The key to success with FB ads is "test and learn" content and pictures, which ad does better is it the picture or the content. You need to have a strategy to "tell the viewer" what you want them to do. Go to the website to download a free buyers guide or sellers guide or click here to find out how much your house is worth, have fun with FB marketing it's the most economical way of reaching your target area in a specific zipcode(s), think local and get leads. I just read from @Jeff Filali he suggested a website called www.investorcarrots.com you might want to check it out.
Good luck!
