Question: In what year was the musician who wrote "Yesterday's Hero" with Harry Vanda born?

Context articles: Harry Vanda
Yesterday's Hero (John Paul Young song)
Oblivia (band)
Lost in Your Love (John Paul Young song)
Vanda &amp; Young
Fool in Love (John Paul Young song)
The Day That My Heart Caught Fire
George Young (rock musician)
Mitch Grainger
Flash and the Pan

Harry Vanda (born Johannes Hendrikus Jacob van den Berg on 22 March 1946) is a Dutch-born Australian musician, songwriter and record producer.
 He is best known as a member of the 1960s Australian rock band The Easybeats.
"Yesterday's Hero" is a pop song by John Paul Young.
 The song was written by George Young and Harry Vanda and was released in February 1975 as the lead single from Young's debut studio album, "Hero" (1975).
Oblivia were an Australian band formed by Tony 'Juke' Jukic and Pete Banner.
 They were discovered by Harry Vanda who signed them to a publishing contract.
 They released one album, "The Careless Ones", produced by Steve James.
 Their debut single "My Friend" was a top 40 hit and earned James ARIA Awards for Producer of the Year and Engineer of the Year.
"Lost in Your Love" is an pop song written by Harry Vanda and George Young.
 It was recorded by Australian pop singer John Paul Young.
 The song was released internationally in October 1978 as the third single from Young's fourth studio album, "Love Is in the Air" (1978).
 The single was not released in Australia.
Vanda & Young were a songwriting/producing duo composed of Harry Vanda and George Young.
 They performed as members of 1960s Australian rock group The Easybeats where Vanda was their lead guitarist and backing singer and Young was their rhythm guitarist and backing singer.
 Vanda & Young co-wrote most of The Easybeats later hits including their international hit "Friday on My Mind" and they were the record producers for the group from 1967.
 Young is the older brother of Malcolm and Angus Young of the hard rock band AC/DC, being the record producer behind several of the band's biggest albums (such as 1976's "Dirty Deeds Done Dirt Cheap").
"Fool in Love" is an pop song written by Harry Vanda and George Young.
 It was recorded by Australian pop singer John Paul Young.
 The song was released in November 1978 as the fourth and final single from Young's fourth studio album "Love Is in the Air" (1978).
 The song peaked at number 58 on the Australian Kent Music Report in January 1979.
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"The Day That My Heart Caught Fire" is an pop song written by Harry Vanda and George Young.
 It was recorded by Australian pop singer John Paul Young.
 The song was released in August 1978 as the second single from Young's fourth studio album "Love Is in the Air" (1978).
 The song peaked at number 20 on the Kent Music Report.
George Redburn Young (born 6 November 1946) is an Australian musician, songwriter and record producer.
 Born in Scotland, he moved to Australia with his family as a teenager, and became a naturalised citizen.
 He is best known as a member of the 1960s Australian rock band the Easybeats, and as a co-writer of the international hits "Friday on My Mind" and "Love Is in the Air", the latter recorded by John Paul Young (no relation).
 Young was also the producer of some work by the Australian hard rock band AC/DC, formed by his younger brothers Malcolm and Angus Young.
Mitchell "Mitch" Grainger (born 12 February 1974), is an Australian blues and roots rock- musician based in Los Angeles, who is best known for his harmonica playing and education thereof through his successful YouTube channel.
 In his 26-year music career he has worked with a long list of iconic Australian rock musicians such as Harry Vanda and Malcolm Young and Californian band The Lovers.
Flash and the Pan were an Australian new wave musical group (essentially an ongoing studio project) formed in 1976 by Harry Vanda and George Young; both are former members of the Easybeats and were a production and songwriting team as Vanda & Young.
 The duo's first chart success was their 1976 debut single, "Hey, St. Peter", which reached number five in the Australian Kent Music Report Singles Chart.
 The next single, "Down Among the Dead Men", peaked at number four in Australia in 1978; it was re-titled as "And the Band Played On" for international release.