What is the internal rhyme in seven ages of man?

In the famous soliloquy "All the world's a stage" from William Shakespeare's play "As You Like It," the seven ages of man are described. The internal rhyme appears in act II, scene 7:

Last scene of all,

That ends this strange eventful history,

Is second childishness and mere oblivion,

Sans teeth, sans eyes, sans taste, sans everything.