Paul has said that when he and John were writing songs, they consciously wrote for a teenage girl audience. In the 1960s there was a very large percentage of teenagers - the "baby boomer" generation, born shortly after World War 2, were teenagers.
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His target audience is the young children aged 3-8.
Their target length early on was two and a half minutes, according to Beatles producer George Martin. Later songs became longer, and "Hey Jude" reached almost eight minutes, breaking precedents worldwide. (A shortened version was released to radio stations.)
The Beatles.
Although I am not entirely sure, I did read that the Beatles signed a contract saying that none of their songs are permitted to be in any commercials in the eighties after "Revolution" was used in a NIKE shoe commercial.
As a group it was The Silver Beatles The name The Beatles was first used in May 1960.