science

Penrose is like 90+, but he never stopped doing speeches and lectures, there's a shit ton on YouTube now because he's (rightfully) been doing a crazy long victory lap the last couple years.

This is a pretty good one that also has Sabine Hossenfelder (leading physicist) and Slavoj Žižek (Eastern European philosopher who's a little crazy) as well:

https://www.youtube.com/watch?v=IdzXbIW9kxY

But it's from Institute of Art and Ideas, and they routinely post amazing lectures about relatively broad topics.

It's always about insanely complicated topics, but the speakers are usually good at breaking it down, even tho the people in attendance are all specialists in whatever field they happen to be talking about.