Webelos hanbook:
P4 - Your son has joined the part of the Cub Scouting program of the Boy Scouts of America that is for fourth- and fifth-grade boys.
...
If a boy has completed third grade, or if he has not completed third grade but is 10 years old, he's the right age for his den.
...
Most Webelos Scouts are in this program for 18 months.
...
...and after he has completed the fifth grade and is at least 10 years old, or is age 11, or has earned the Arrow of Light Award and is at least 10 years old.... Boy Scout.
I stand corrected (re: Webelos I vs. Webelos II), three mont