Hi Dennis sensei,
Another interesting thread starter from you! Thanks.
Having travelled to Fukuoka to train with Suganuma Sensei I can tell you the feeling I picked up on there. It's very much a mindset of "train your age/ability". So, the "young lions" train very physically (mostly after class during free practise)and the older ones tend to take a more staid approach. They still train hard, but hard for them. During formal class the mats are usually too crowded to train big/fast/hard, or, at least this is the impression I got while there. Age ranges were young adult to eighty plus years old.
I should say that Suganuma Sensei always says: "Mori-o shinai" (spelling is hooped I'm sure) or "take it easy".