My workstation is a Latitude E6420, that is nearing a decade old. 8G of RAM, and a 256GB SSD. I don't know what kind of proc, or what kind of RAM, or any other specs really. It works, and it's all that matters to me. I'm not a huge hardware nut.
Linux is my OS. Right now, sitting on Manjaro, but I am not religious about my distro. I am however, pretty religious about my window manager, to a point: It needs to be light. I open a terminal, and maybe a web browser. But my browser is secondary, only for sites that absolutuely require it. So, i3wm tends to be my go-to, since it's keyboard focused, and allows me to stay in the same "interface mode".