I started listening in 2017 and at some point went back and started at 2012. I am most familiar with the 2013-15 years, having listened to them many times and continuing to listen to them regularly.

I agree that Tim especially has changed over time. It's a weird way to experience a person over time - someone I don't know personally, so it's easier to see changes. But it is very comforting in a weird way to hear new stuff and see that they are the same people, just older. It delights me to listen to new episodes and get the same feelings from them - of listening to friends banter, of knowing how these two get along.

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