I think you misunderstand. The GP comment isn't talking about inflation in general being misleading, but the monthly year-over-year change. For your analogy, i

I think you misunderstand. The GP comment isn't talking about inflation in general being misleading, but the monthly year-over-year change. For your analogy, it's perfectly reasonable to say a population's average age is 32. But it gets muddy when you start comparing the rate of change of the rate of change, so if the age was 31 last month people start extrapolating that we'll all age 12 years in the next 12 months.