There are some attributes, like passing, that need to be much higher for your guards.
At Div-II, I don't even look at guys who are under 35 passing if they have high potential or under 50 passing with average potential for a Guard spot. (That means about 60 minimum as a JR/SR). IMHO, your guards need to have 60 or above as JR/SR for Speed, PER, BH, and Passing. If you want a guy at PG only, you might be able to go a bit lower on PER, but then you need to have much better BH and Passing.