He is 12. I read his rank the other day but don't remember. It wasn't pueblo or "rookie." He had been in the Boy Scouts for a year.
He's likely either just at "Scout" rank, or possibly tenderfoot... if he's only been in a year. At 12, he's been a scout for at most 1-2 years... If he's on the verge of becoming 13, he may have achieved another rank or two.
Boy Scouts start at age 11. Cub Scouts (WEBLOS) transition to Boy Scouts at age 11, in February. I just crossed over our WEBLOS last month to the local Boy Scout Troops at our Blue and Gold.
The lowest rank in BSA is Tenderfoot. Of course he may not have advanced to a rank yet, and since he was in Webelos for two years before entering the Boy Scouts, they may have been still referring to him as a Webelo.
I think the park ranger spokeswoman said his rank was webelo (sorry if I misspelled).