Luke 2. Jesus was twelve

Luke 2:42 NIV
When he was twelve years old, they went up to the festival, according to the custom.

Jesus was twelve. There was a gap between Jesus was consecrated at the temple and purification rite and now already twelve. There is no recording of between 1 to 12 years old.

Luke 2:49 NIV
“Why were you searching for me?” he asked. “Didn’t you know I had to be in my Father’s house?”

Jesus was twelve and he already know that he is the Son of God.

Twelve.
1.  There was 12 disciples. Why 12?
2.  Standard 6 is at the age of twelve.
3.  My house number is 12.

Any Significant?