That doesn't seem to be what the study they cited said though. Basically the common model was that metabolism steadily declines with age (for adults). The stud

That doesn't seem to be what the study they cited said though. Basically the common model was that metabolism steadily declines with age (for adults). The study cited[1] says that doesn't match their data. What they found was that metabolism was higher than expected for kids 1-20, stable for adults 21-60, and lower than expected for senior adults 60+. [2] I don't want to say thresholds but you can look at the figures and see the rapid increase (0-1), decline (1-20), stability (21-60), and decline again (60+). So age probably matters more to metabolism (than we thought) for some age groups but not for other age groups. And I don't think there was really anything about lifestyle other than this bit: > consistent with the hypothesis that energy intake is coupled to expenditure But obviously that won't help anyone lose weight (which is usually what people are complaining about when they complain about an assumed slowing metabolism) cause it's saying people take in more calories when they burn more calories. [1] https://www.science.org/doi/10.1126/science.abe5017 https://www.science.org/doi/10.1126/science.abe5017 [2] https://www.health.harvard.edu/blog/surprising-findings-about-metabolism-and-age-202110082613#:~:text=points%20of%20this%20study https://www.health.harvard.edu/blog/surprising-findings-abou...