Well.... I just realized I read crookedly across the chart, and dropped 10 years of training out of the math. (It breaks down to 3 years up until 6th, then 10 years in grade, for a total MINIMUM of 35 years {3+3+3+3+3+10+10}.) But the argument still holds. Why couldn't someone in their 40s or early 50s do a physical test?Is it a 2 year wait between every grade, then?