Hi Rob,
Taking the regulations from 1941 as the source here is DJ to HJ at 14:
The transition ceremony from DJ to HJ (and JM to BDM) took place on Hitler's birthday (in that year it was Sunday, the 20th of April). The requirements for the DJ and JM were that the child had to have completed his/her 8th year of school and have been born between 1.7.1926 and 30.6.1927. Exceptions to this could be made in individual cases.
Lots of preparatory work was required prior to the ceremony on Hitler's birthday and the timetable was as follows:
(by) 15.2:
Gebiet staff distributes lists to the Banne showing the required future strength of the specialist units (Flieger-HJ etc).
20.2: The Fähnlein, Gefolgschaften, JM and BDM Gruppen pass applications from those wishing to join the specialist units to Bann staff.
20.2 to 5.3: Conference at Bann level allocates children to the various specialist units to meet the quotas set by the Gebiet staff. The final lists are promulgated to Fähnleinführer and JM-Gruppenführerin.
9.3 to 23.3: Parade held at Fähnlein-level. The boys' future units are entered into the transfer certificates. The girls' units are entered into their certificates and these are all then sent to the Bann staff. Once processed, the certificates are given back to the boys and girls.
20.4: The ceremony 'Verpflichtung der Jugend' is held under local arrangements.
23.4: The boys and girls report to their units for duty and also hand in the transfer certificates.
10.5: All units report their respective strengths to Bann and Untergau.
by 20.5: Bann and Untergau pass unit strengths up to Gebiet and Obergau staff
By 31.5: Final report is sent up the RJF Organisationsamt.
There is stacks more on this in the regulation I'm quoting from here so if there's anything else you need to know just give me a shout Rob.