That was his area of focus about a decade or so ago. It turned out not to be as exciting as many thought it would. There are some benefits to TransResveratrol, but not what people were hoping for. Here is an interview with Dr. Rhonda Patrick and he talks about longevity genes. [1] I believe he covers TransResveratrol here. He also talks about reversing the Horvath Clock and reversing damage to optic nerves.

[1] - https://www.youtube.com/watch?v=5DtWqzalEnc