At age 15, he received an award for best Judo player of year after winning a Judo championship that same year. Upon his entry into Takushoku University at age 18, he began his karate training. It was here that in 1941 he met Gozo Shioda, the future head of the Yoshinkan Aikido dojo. During the period between 1940 and 1943, Terada Sensei had learned Sumo from Akutsugawa Sensei, Judo from Sone Sensei, and Kashimaryu Jujitsu from Osugi Sensei.
At age 21 in 1943, Terada Sensei joined the Imperial Japanese Army due to the ongoing war. In March 1944 he was ordered to the Japanese Airforce Academy and became an aircraft mechanic. From 1944 to 1945 he worked in aircraft maintenance at Kumamoto Airfield. It was hear where he learned that the war had ended and two days later on August 17, he returned home to Nagasaki.
Terada Sensei moved to Tokyo in 1948 and worked for the Miyakoshi Company. In 1950 he went to work for the military police in Yokohama. This same year he joined the Aikikai Honbu dojo. His primary teacher was Kisshomaru Ueshiba Sensei and also took lessons from aikido founder, Morihei Ueshiba.
In 1952, Terada sensei conducted an aikido training seminar for the NKK Company and at 85 different police stations with Gozo Shioda Sensei. In 1955 he conducted aikido training for the Police Department in Yokohama and at the US Army base, Camp Drake in Saitama.
In 1955, along with Gozo Shioda Sensei, he co-founded Yoshinkan Aikido. In 1957, the Yoshinkan was visited by US Senator Robert Kennedy and Prime Minister Nakasone. Terada Sensei served as chief instructor of the Yoshinkan honbu until 1961 when he left Tokyo to teach aikido at US Naval Base in Yokosuka. It was here that his most senior student, Amos Lee Parker began his aikido life.
Terada Sensei received his 9th degree black belt from Gozo Shioda Kancho in 1990. At this time he also received the title of Saikō Shihan (Chief or Head Shihan). Today he serves as the president of the National Yoshinkan Renmei and the president of Aikido Yoshinkan Seiseikai. Terada Sensei currently holds the title of Yoshinkan Aikido Saikō Komon. (Yoshinkan Aikido Supreme Advisor). It was announced in January 2008 that Terada Sensei was awarded 10th dan by the Yoshinkan Foundation making him the first to receive such an honor by the Yoshinkan.