when did he start painting?
At the age of 19.
Norman Rockwell
At 19, he became the art editor for "Boys' Life"
who created the freedom of worship (painting)? Norman Rockwell.
wiki:11625140
Norman Rockwell [SEP] Early years
In this role, he received 50 dollars' compensation each month for one completed cover and a set of story illustrations. It is said to have been his first paying job as an artist. At 19, he became the art editor for "Boys' Life", published by the Boy Scouts of America. He held the job for three years, during which he painted several covers, beginning with his first published magazine cover, "Scout at Ship's Wheel", which appeared on the "Boys' Life" September 1913 edition.