The joyful mysteries, however, are also called joyful because we, your children, rejoice with you. You have made of these events, occasions of great joy for us. Thank you, my Dear Mother Mary. Oh, my Mother, your Son is twelve years old. He is at an age when He is leaving childhood behind and begins to enter into His Manhood.
Twelve is a sign of maturity and of completeness.
There are twelve months in the year. There are twelve tribes of Israel. Your Son chose twelve men to be His apostles. There are twelve gates in the walls that surround the New Jerusalem, and twelve angels guard those gates. And when your Son performed his first miracle of the loaves and fishes, they collected twelve satchels full of scraps.