"Younger scholar" are people that are mid-ish career (like Chris Uggen) and those who are older, but not yet retired (like Messner).
LMAO Messer is a "younger scholar"?? He got his PhD in the 1970s for gods sake. What is "older scholar" to you? 6 feet deep?
Well since the critique was that google scholar citation rankings are populated by people who are in fact 6 feet deep, yes?