Can I update my 2009 IMac to Catalina?

FoxFifth wrote:

Yours can be upgraded to High Sierra: How to upgrade to macOS High Sierra - Apple Support

Only Late 2009 iMacs can be updated to High Sierra. Early & Mid 2009 iMacs are stuck on El Capitan.

Only 2012 or later iMacs can be upgraded to Catalina. See: If your computer doesn't recognize your iPhone, iPad, or iPod - Apple Support

Yours can be upgraded to High Sierra: How to upgrade to macOS High Sierra - Apple Support

Nope.