vegetarian* although I think he's said that he tries to avoid eggs and dairy. There does appear to be some emerging evidence that a vegan/vegetarian diet can significantly slow the epigenetic clock, but I don't know to what extent I trust that without more studies that can be reviewed in a meta-analysis (this 2024 study was performed on twins over the course of 8 weeks). Still, though, I won't complain if it turns out to be true.

Edit: I mean the reason Tim Walz has aged so much is because of how evil and hateful he is!!