A huge new Henri Matisse show in London is many things — bold, colorful, exuberant. It’s also a great advertisement for the creativity of old age. The 130 works displayed at Tate Modern were created largely in the last decade of the French artist’s long life, when Matisse — in a wheelchair, recovering from cancer and unable to paint as he once had — used scissors and paper to create a series of big, bold and ambitious cutouts. Henri Matisse: The Cutouts is the biggest-ever exhibition of Matisse’s paper works, and is sure to be a hit. Organizers say it could surpass the 2002 show Matisse Picasso as Tate Modern’s best-selling exhibition.