Grande sonate: Les quatre âges, Op. 33, is a four-movement piano sonata by Charles-Valentin Alkan. The sonata's title refers to the subtitles given to each movement, portraying a man at the ages of 20, 30, 40, and 50. The work was published in 1847, dedicated to the composer's father, Alkan Morhange.

A piano sonata is a sonata written for a solo piano. Piano sonatas are usually written in three or four movements, although some piano sonatas have been written with a single movement, others with two movements, some contain five or even more movements. The first movement is generally composed in sonata form.