Answer by taking a quote from the following article:

Johnny Young (born Johnny Benjamin de Jong; 12 March 1947) is a Dutch Australian singer, composer, record producer, disc jockey, television producer and host. Originally from the Netherlands, his family settled in Perth, Western Australia in the early 1950s. Young had a career in the 1960s as a pop singer and had a number one hit with the double-A-side, "Step Back" and "Cara-lyn" in 1966, and his profile was enhanced by a concurrent stint as host of the TV pop program The Go!!

In 1970, Young formed a production company with Kevin Lewis (former Festival Records executive), Lewis-Young Productions, which developed the pop music television show Happening '70 - hosted by Wyllie - for the ATV-0 channel, it was subsequently followed by Happening '71 and Happening '72. Lewis-Young Productions also developed Young Talent Time from April 1971, a children's variety show and talent quest with Young as host. Regular cast members were known as the Young Talent Team, the show was a launching pad for several Australian performers including Jamie Redfern, Debra Byrne, Dannii Minogue and Tina Arena. The directors were Garry Dunstan and Terry Higgins. Each episode typically ended with Young and the team singing "All My Loving" as a lullaby. Young established the Johnny Young Talent School for performance arts in 1979, some of its students became contestants and regulars on Young Talent Time. 2004 Australian Idol runner-up Anthony Callea trained with the school, as did the 2008 winner, Wes Carr.  As well as producing the television series, Lewis-Young Productions distributed related merchandise including records on their own label (L&Y), books and magazines, a board game and a set of chewing gum cards. In 1972, Caravan Holiday, a short film, featured the original six Young Talent Team members plus two recently recruited new members, Greg Mills(later to be musical director in last years of YTT) and Julie Ryles (who died in early 2011) with cameos by pop star Johnny Farnham and long term judge Evie Hayes. Young was cast in multiple cameo roles as a service station attendant, farmer, speed boat attendant and camping park manager.  In 1989, Ten Network (formerly ATV-0), axed Young Talent Time quoting poor ratings against the popular variety series Hey Hey Its Saturday. Young had committed to building his own television studios to film Young Talent Time and was forced to sell his family home to finance the debts. During the year his stepfather died and, with his mother, he tracked down his biological father. Soon after his mother also died, and his marriage was in trouble. On 9 March 1990, Young was inducted into the TV Week Logie Awards' Hall of Fame for "an outstanding and sustained contribution to Australian television."  From 24 October 2006, weekly magazine New Idea featured articles on Byrne's autobiography, Not Quite Ripe, which alleged that from the age of 12 she was introduced to sex, drugs and alcohol on Young Talent Time. The claims were vigorously denied by Young, he stated that Byrne was already 14 when she started and that drugs were not available on set, "Any drug-taking Debra did, she certainly didn't do it on our show." He said no-one on the show was aware of her affair with "Michael", a boom operator ten years her senior. According to Byrne the pair had run off together for a weekend when she was 15. A producer for the show had "Michael" replaced as boom operator. Byrne also claimed that her parents knew of her relationship with "Michael".  In 2009, Young indicated that he was in talks with Network Ten to create an updated version of Young Talent Time. The new series aired on Network Ten from 22 January to 4 May 2012 and was hosted by Rob Mills, with Young serving as executive producer and judge.

Did many people go on the show?
the show was a launching pad for several Australian performers including Jamie Redfern, Debra Byrne, Dannii Minogue and Tina Arena.