Can I find a Goblin Tinkerer on a pre-1.1 world?

I'm never sure what to do when Terraria updates, make a new world or continue on my old one where I already have my potion/mushroom farms/proper storage. I really want to make some of the things that the Goblin Tinkerer offers, but I'm not sure whether or not he can be found on a world generated before version 1.1.

If I'm on a world that was generated before version 1.1 and a Goblin Invasion occurs, will I be able to find the Goblin Tinkerer somewhere in my underground, or will this only work on post-1.1 worlds?

Yes, you can. He isn't generated with the world (else nobody would ever find him), but instead spawns near you underground for you to rescue, after you've defeated a Goblin Army.

The only catch is that Goblin Armies defeated before patch 1.1 do not count, because it's the first version to keep track of that. You'll have to wait for the next invasion, or use a Goblin Battle Standard.

Yes, you can.

I just found him today, in my very first world that I created before the 1.1 update.