As an orthodontist, I commonly recommend wisdome teeth extraction, it
all depends on the patient's orthodontic treament, and amount of room
available for the teeth to come in.  I do agree that 13 is a tad bit
early for extraction, and I would like to see the Pan, but for examle
if the ortho tx distalized molars, and the growth pattern of the jaws
is not favorable there is a Super high chance that they need to come
out.
Who knows, perhaps, the 3rds, in this caes are causing some  
pathological problem, like reabsorbing the 2nd molar roots.
Anyway, would be nice to see the Pan and intraorals, and growth xrays,
etc. Sorry Duckiedarling, there is just not enough info for me to help
specifically.

Dr. Braces