One summer at a good sleep away camp can accomplish more in terms of Chinuch (education) than a Bar Mitzvah in many cases.
Ask the boy.
I question the practice of fathers (who are not practicing Klei Kodesh) using their Rabbinic title in the invitations.
On one hand it may be improper display of frumkeit.
On the other hand the knowledge that one will get opportunities later in life to display the title, may be needed to spur one along in his own learning.
Perhaps the title will spur the son in his learning?
One famous righteous convert in the time of Hillel was initially spurred on to convert and learn by the prospect (in his mind) of becoming the high Priest.