Do the ADCOM's care if one or two of your letters of rec are a couple years old? Is it better to have LOR's that are more recent? I searched and couldnt find anything on this so hopefully it is helpful to anyone else with the same question.
I think it should be fine. One or two years isn't bad - five or six, then you may want to get new ones. In fact, I was a reapplicant and had all of my previous letters sent in the next cycle and got in.