It's used for shorthand for "getting ready" in my neck of the woods, usually doesn't have any relation to age, injury, or illness. Many a times as a kid I can remember my parents saying "alright Kids get around, lets go". Sometimes even both are used. "Hurry up and get around, We're getting ready to go!" Mostly It's used a direct replacement for "getting ready" if a woman is still putting on makeup and getting dressed she's "getting around.". I still use "getting ready" I'd say it's a pretty even split its just whatever one rolls off my tongue at the moment. I guess it's one of those sayings right up there with the ole knee slap followed by "Welp, it's about that time." when you've stayed way longer than you intended too and you wanna politely leave.
