After seven years I've replaced my MacBook Air with a Mac mini, with the biggest help being the 16GB of RAM. The MacBook Air had 4GB, so I figured I needed 8GB, then doubled that to plan for the future. I opted for the regular 3.6GHz, quad‑core, 8th‑generation Intel Core i3 over that potential upgrade, as I'm not into gaming or heavy-duty video editing.
As usual, setup is a breeze and even my desktop files, which are automatically backed up to iCloud, magically appeared on the new machine. This one should last until I'm in my seventies.