'Remarkable that both Zborovsky and Skvortsov fought with the Russian Corps in Yugoslavia during the partisan battles of the early 1940s. They would both have been middle aged men then, well into their fifties, and the former wounded in WWI.'
It rather depends what they were doing. 50-plus is a bit old for hand-to-hand fighting, but in conventional armies most senior officers are in their forties at least. For example, Field Marshal Montgomery was 55 at the time of El Alamein, and Rommel 51. Rundstedt was born in December 1875, and only finally dismissed by Hitler in March 1945, so still commanding at 69. Hindenburg was 67 and recalled from retirement at the beginning of WW1! I grant you, commanding a conventional army is rather different from leading a partisan band.
Ann