Just eat a varied diet to make sure you have a variety of beneficial antioxidants and aren't deficient in micro-nutrients.
AGEs generated by carbs can accelerate aging and I personally avoid legumes due to their antinutrient content, fried potatoes are quite bad due to insane insulin spike and pronounced solanine (very inflammatory!) levels.
'Blue zones' are areas of the world like certain Grecan areas and Okinawa that have higher lifespans and general health than most. Their diets include plenty of vegetables (dark leafy greens), fatty fish, olive oils, nuts and berries. Meats are fine but as a general rule I avoid non-organic fatty meats due to the monogastric nature of pork/chicken enabling phytoestrogens from soy-based feeds and various other fat-soluble toxins storing in the fat. Non-organic pork in particular is very high in Linoleic Acid and soy phytoestrogens, beef is fine non-organic due to the polygastric nature of the cow breaking down toxins, in fact it's for this reason that ruminant meat is the healthiest. Beef, Goat, Mutton, Lamb, Venison etc. Omega-3s have a ton of research behind them and seem to be correlated with positive health outcomes; the best sources are Sardines, Mackerel and Salmon which are generally low in mercury too. Fermented foods appear promising for enhancing longevity and contribute to the stomach microbiome, and actually the effect our microbiome has on health is an emerging field of research with tons of potential. Kefir, Tempeh, Kimchi and other fermented foods have some evidence in boosting Lactobacillus and Bifidobacterium strains in the gut; these can have serotonergic effects and improve brain and general health.
Try and eliminate LA rich oils and added sugars. When it comes to carnivore dieters I think it is an overblown fad; most carnivore dieters I've seen look puffy, graying hair and very red, unhealthy-looking complexions. I'm thinking of Ken Berry specifically.
Lastly I would eschew any supplements unless absolutely necessary. The problem with supplements is that they are very poorly regulated and can sometimes contain high amounts of heavy metals. Furthermore many contain forms of the desired micronutrient that are not bioavailable. The trifecta of supplements for male health are Vitamin D., Zinc and Magnesium, these are the only three I would recommend.
