Your reality isn't the same as the organizations.
w11 6/15 p. 6 Should Youths Get Baptized? ***A Christian mother writes: “Children who are baptized have more reasons to stay away from the bad things of the world. My son, baptized at 15, feels that baptism is a protection. ‘You don’t think about doing something contrary to Jehovah’s law,’ he said. Baptism is a strong motivation for righteousness.”
w06 7/1 pp. 29-30 par. 16 Youths, Make It Your Choice to Serve Jehovah ***Numerous Witnesses around the world feel that their decision to get baptized when they were young helped them greatly. Take as an example a 23-year-old Witness in Western Europe. He recalls that getting baptized at the age of 13 motivated him to be careful not to be swept away by “the desires incidental to youth.” (2 Timothy 2:22) Early on, he set his sights on serving as a full-time minister. Today, he serves happily at a branch office of Jehovah’s Witnesses. Rich blessings await all youths, including you, who choose to serve Jehovah.
w87 4/15 p. 13 par. 14 Gaining Peace With God Through Dedication and Baptism ***If one has ‘counted the cost,’ it places one at no disadvantage to make a dedication as a youth. With almost all new Christians, after baptism appreciation deepens. “Getting baptized as a youngster was a protection for me,” explained David. “As I got older, I noticed how some unbaptized teenagers in the congregation felt free of the authority of the elders and as a consequence veered into bad conduct. But I always remembered that I had dedicated my life to God. My life was already taken, so I could not follow such teenagers.”
There are many more articles about members being baptized at young ages and how good it is.
In the end it is the elders that have the yes or no to baptism, but it is the parents that study with and prep the child. So wanting to have children baptize at the age of 9 -11 as GB Mark Sanderson said in his may 2015 Germany public talk starts with the parents and is reality.
Jesus was 30, but that has nothing to do with this conversation. The only way that would be relevant is if the JW's followed in those foot steps and weren't allow baptism until that age.
It means that a person is accepting the fathers(God's) authority and laws. His purpose is now your purpose.