Can I upgrade to OS X El Capitan on my Mac?

Episode 1270 (1:53:14)

Ronnie from West Hollywood, CA
Mac OS X El Capitan

Ronnie has an iMac that runs OS X Lion and he's stuck with it, according to a salesman at Apple. They said it won't run El Capitan. Leo says that the retail guy is wrong! Apple offers a free upgrade for Lion. What he may be talking about is that if he erases the hard drive, he can install the OS over the air by downloading and installing. In that case, it will download the OS that came with the Mac. But then he could upgrade for free. A ten year old Mac can upgrade to El Capitan.