What confuses me with these reports is always on what they miss to say: here, they mention two turning points for metabolism (at 15 months and 60 years), and th

What confuses me with these reports is always on what they miss to say: here, they mention two turning points for metabolism (at 15 months and 60 years), and then constantly keep talking of having a stable metabolism from early adulthood to your 60s. This suggests that kids from 15 months to early 20s have a slowing metabolism, but there is no hint about at what rate? Is it linear? Is there any sharp drop? That might affect how we need to influence our kids' eating habits, and it seems under-researched (according to this article, at least).