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Thanks for all your answers so far, the tickets were bought by someone else not myself so I do not know if there was any age advice on the website (Bournemouth BIC), I have not checked myself because to be honest I really would not have expected anyone that young to be at a concert of that type, so would not expect to see warnings on the booking website.
I agree Joggerjayne that her swearing is beeped out when played on the radio, but certainly not at her concert!
Hi Boo, I expect you are right that there is far worse swearing at football matches, but you would not expect to hear anything from the players that is loud enough to reach the kids ears and the public do not particularly have a duty not to let any kids hear any bad language.
But with Jessie J, it was amplified and you could not possibly miss it! It is not Jessie J's problem as she is playing to a mostly adult audience, the responsibility lies with the parents who chose to take their youngsters to this kind of concert.