I guess I’ll end up building one haha. Thanks guys. It’s a lot of work just to play age of empires 3.
Yeah AoE 3 is old so any 2nd hand system with a decent graphics card will give you a lot of life. Here is AoE 4 for reference on hardware that is 2 generations old.
If you look at the 10:19 mark you'd want to be at the good / great level.
Building a PC can be a lot of fun and frustrating especially when it doesn't boot up, troubleshooting can be a nightmare especially for novice builders. A used gaming laptop from the last 2 years will be the fastest way to start playing - all the peripherals are right there in the laptop (keyboard, touchpad, screen) so you could just add on a 27" screen (for old eyes) a mouse and you're off to the races. You will be limited in terms of upgrade path for laptops, but if you're playing older games a gaming laptop will give you plenty of runway.
Or if you want to pick up a pre-built desktop from Best Buy that works too, set your budget and let us know which ones you're looking at. The best part of a desktop is the upgradeability if you want to give your PC a few extra years and you can get away with older hardware. For reference I do very light gaming, couple of indie titles and older AAA games, running on hardware that is 5 years old.
Happy to give our 2 cents and add to the madness if you'd like.