The Wikipedia article on Wernher von Braun states that he was confirmed as a Lutheran as a child. That would put this event at about twelve to fourteen years of age, or in the range 1924-1926. Depending on your definition of "becoming a Christian", that's probably your answer. Could've been later or earlier, though.
Carol M. Braun is 61 years old.
Nicholas Braun is 29 years old (birthdate: May 1, 1988).
Steve Braun is 62 years old (birthdate: May 8, 1948).
Jennifer Braun is 26 years old (birthdate: April 27, 1991).
Tamara Braun is 46 years old (birthdate: April 18, 1971).
TV presenter Suanne Braun is 49 years old (birthdate: February 29, 1968).
Adolf's wife, Eva Braun, was 33 years old when she died.
Michael Braun is 33 years old (birthdate: March 24, 1978).
Eva Braun was born on February 6, 1912 and died on April 30, 1945. Eva Braun would have been 33 years old at the time of death or 103 years old today.
Eva Braun died on April 30, 1945 at the age of 33.
Matthias Braun died on February 15, 1738 at the age of 53.
US senator and ambassador Carol Moseley Braun is 69 years old (birthdate: August 16, 1947).