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Lab animals protected against stressors live longest of all. You get extremely long life spans in rats kept in sterile environments and fed plenty of very high quality food regularly. Aging is accumulated stress. It is not a genetic program.

“Every stress leaves an indelible scar, and the organism pays for its survival after a stressful situation by becoming a little older.” --Dr. Hans Selye

The pro-hormesis claims I've seen are highly dubious. You constantly see caloric restriction and fasting brought up. It's bunkum. Within a species the animals that eat the most live longest. The restriction idea developed from two misunderstandings: 1) If you restrict feeding early in life the growth of the animal is stunted, and within a species smaller animals live longer. 2) Lab grade animal chow is loaded with mildly toxic things like soy oil and oxidized whey protein, so eating less of it rather than more is preferable.