Using 200 repos is just creating unnecessary problems. Use a monorepo.
That said, all the solutions are applicable irrespective of how many repos you have. First I'd heard of an "age report" too. I like that idea. It's too easy for bugs to be marked low priority and then never get fixed.
High priority tickets are naturally noisy and fixed quickly for impact reasons. Age reports create a good balance by gradually increasing the "noise" of all tickets regardless of priority.
That said, all the solutions are applicable irrespective of how many repos you have. First I'd heard of an "age report" too. I like that idea. It's too easy for bugs to be marked low priority and then never get fixed.