Heh, my wife has some sourdough starter that she got from her Mom who got it from here Mom etc. It's like pre-civil war sourdough starter. Except that like anything that grows it evolves over time. So I presume it picks up local yeast as it grows and eventually becomes a "local" variant. I find it particularly interesting that different starters make for bread that tastes different.

If you are bored you can do the same thing we did which is to take your ingredients and make loaves from different people's sourdough starter. All the same ingredients except for the starter and experience that for yourself.