Lynn gave an iPhone 6 Plus to her dad and he loves it. Now she wants to get him a computer for Christmas and he wants a desktop. Leo says at her father's age, he really doesn't need a Windows or Mac desktop. Leo recommends the Chromebox. It's a desktop version of the Chromebook. It'll be far easier for him. With new versions able to support Android apps, it's a great bargain.
Another option is the Intel NUC. It's a tiny, hockey puck sized computer that you can connect everything to. It's essentially the Mac Mini for Windows. It has an i5 processor, 8GB RAM, and 256GB SSD. Ideal for a retired computer technician.