The TV chef and presenter was revealed as the seventh celebrity to join this year's line-up after previously announced soap stars Gemma Atkinson and Davood Ghadami, Holby City's Joe McFadden, TV host Ruth Langsford, singer Mollie King and former Communards star Rev Richard Coles.
By contrast just one in 10 have been over 50, and only three contestants have taken to the dance floor in their 70s.
I'm so happy to be joining Strictly 2017, it is such a brilliant show and I've followed it for years.
When her role was revealed back in May, Shirley exclaimed: 'I can't wait to get in to the ballroom and be part of the incredible and respected judging panel'.
"I'm both nervous and excited to learn from the professionals about a whole new way of dancing!"
He continued: "I've always been a HUUUUGE fan of the show".
Best known for: competing on The X Factor as part of boy band JLS and going on to score five number one singles.
The 200 contestants have included 62 actors, 48 TV/radio presenters and 34 sport stars, according to analysis by the Press Association.
The 30-39 age group alone has accounted for 35% of competitors.
The PA's analysis includes only those people to appear in the proper TV series, and does not include Christmas or charity specials.
But judge Craig Revel Horwood dismissed reports of racism previous year after three of the four non-white contestants, DJ Melvin Odoom, EastEnders actress Tameka Empson and TV presenter Naga Munchetty, were voted out by the public in early rounds.
As the news was announced on Sunday Brunch, Rimmer admitted the BBC dancing competition would be his first attempt at ballroom or latin.