Younger acts and singing pensioners made their mark on Britain’s Got Talent as auditions reached their fifth round on Saturday night.

Among those making a big impact on the show was 19-year-old soul singer Rosie O’Sullivan, whose performance was so powerful that it even prompted a standing ovation from Simon Cowell.

Although the 19-year-old openly admitted to lacking in confidence, she sailed through to the next round after receiving rave reviews from all four.

“You sang that brilliantly,” Alesha Dixon told her. “Your control is fantastic, and I have a feeling we haven’t seen the full range of what you can do.”

Meanwhile Simon Cowell added: “That was absolutely fantastic….you have a really authentic throwback soul voice. Amazing.”

Also faring well on Saturday night’s show were pint-sized dance troupe Pre Skool – who consisted of younger siblings of 2012 finalists Nu Skool.

“We got together because our brothers and sisters got to the finals of Britain’s Got Talent last year and we saw them on TV and thought ‘why don’t we have a go at that?’ explained members of the group, who are aged between five and eight.

And their routine – which saw them performing to an LMFAO mash-up while dressed in school uniforms – saw them through to the next stage.

Others who impressed the judges included teenagers Jack and Cormack – who showed off their musical prowess with an acoustic version of the Of Monsters and Men hit Little Talks – as well as dayglo-dressed dancers Youth Creation.

However it wasn’t just the youngsters who got a look in – with 71-year-old singer Kelly Fox causing a big stir when she took to the stage.

The leopard-print clad pensioner wowed both judges and crowd with a gutsy version of All Purpose Blue’s Band’s Kiss My Ass.

And Simon – who had looked sceptical when she first appeared – quickly changed his mind.

“You’re a little tiger aren’t you,” he said. “I love the song and I’m doing to remember you. I think you’re terrific.”