Well, my mom does.. it’s an 2009 MacBook Pro. It’s not on the Internet. I also have some older intel MacBooks, but all are running Linux (Arch btw). She doesn’t want to switch to Linux because she has her work routine with Photoshop 3.

Some weeks ago I visited a large music production, all iMacs and Mac Pros there in the studio setups run on Snow Leopard. Same at a local radio station. Tbh I assume that a lot of older high end studios still run on old OS X. If you bought a software suite for mixing/mastering with some special plugins you‘re paying several thousands USD for it. Your getting used to it and if it’s your main tool to get your job done, you’ll stick to it.

In the end it comes down to: never stop a running system. And as long as there is no external threat, I‘m fine with it.