1. Something that was created a relatively long time ago but which is still excellent by today's standard. Ah, the White Album—that's an oldie but goodie! Here, try this book. It's an oldie but a goodie.

2. A person who is advanced in years but is very likable, reliable, helpful, etc. I'm giving you a desk next to Martin. He's an oldie but goodie who will help show you the ropes. A: "You're an oldie but a goodie, Aunt Lily!" B: "Hey, I'm not old!"