What's the oldest Apple product that you still use regularly?

A few nights ago I started a post titled "What was the first Apple product you ever bought?" There were a lot of interesting answers and because a lot of the products that you guys listed we quite old, another question came to mind.

Now I'm curious...

What's the oldest Apple product that you still use regularly?

Interpret "regularly" as you will. I personally mean to it say something that you keep up to date and use quite often as one of your "default" devices.

I'm still relatively new to the Apple world, so for me, it's just a 3rd generation iPad, purchased in May, 2012.