What is the oldest stock in your portfolio?

Basically the title.

I am fairly new and novice to the world of stock trading. But I always feel curious about things like how the stock portfolio of a person would look like who had been doing it for decades.

And specially what’s that one stock that have been either holding or never sold or their oldest/first stock purchase. Like for example people here very commonly and always advice buy index funds and forget. I can’t imagine how that would have been.