[2] Presented for its first five series by Nicky Hambleton-Jones, who was replaced by Myleene Klass for series six,[3] with Cherry Healey[1][4] hosting the show for Channel 5, with the programme's full name also being used in Australia.
At the start of the programme the person's age is guessed by 100 people on the street and an average is taken.
The programme regularly makes use of cosmetic surgery, which has attracted criticism from some quarters.
However, in his book 10 Years Younger: Cosmetic Surgery Bible, the show's resident consultant surgeon Jan Stanek says: "I decided to take part in the series because I felt that it offered an opportunity to shine an honest light on what was involved in cosmetic surgery and to address some of the common misconceptions about it.
The third book is written by Jan Stanek with Hayley Treacy.