There was no separate prize money for 35 and over. Prize money was for open runners and masters runners (40 and over).
In response to this thread I followed up with a guy I know who was second at the Buffalo Half. Kiptoo not only took the masters prize money there, but took $1000 for the masters course record as well, which my friend would have earned had Kiptoo been properly categorized as an open athlete.
What really confuses me is why RDs are paying out prize money for masters runners in the first place. Look, I am not going to complain, but it doesn't seem to make a ton of sense to me. With rare exceptions (Castille, Abdi, Lagat, Meb, Clint Wells), the masters athletes are not going to be pushing the top open athletes at many races, and by and large, most masters runners aren't going to travel to a race just for the prize money if they don't think they are going to be in contention for the prize money, so it doesn't generate a bunch of entries for the race. I am honestly not sure why they do it.
But if they are going to do it, it should be an honest competition.