Linux is as plug and play as it gets now, if you choose the right distro. It's easier than Windows at the very least. Again, SteamOS is just a Linux distro.

If you want something, Garuda Dragonized comes with everything you need already installed and a GUI tool to quickly add anything extra you may want. It's as easy as it can be.

Also, I want to try to word this as politely as possible, but there are a lot of older people who continue learning new things. It's actually good for your brain health to do so. Refusing to learn something new isn't because of your age. It's a choice. You're free to make whatever choices you want though.