"50 & Counting.." was a concert tour by The Rolling Stones to celebrate the 50th anniversary of the band. When did it start?

Explanation

Since forming in 1962, the English rock band The Rolling Stones have performed more than two thousand concerts around the world. Many audio recordings exist of Rolling Stones concerts, both official and unofficial. Seventeen official concert albums (eighteen in the US) have been released by the band (anno 2014). The biggest concert the band has ever given was in Rio de Janeiro, Brazil, during the "Bigger Bang Tour", in 2006.