"My twin sister was a terrible pessimist, she died when she was not yet 70 because she never laughed, never. Laughing is beautiful though," says 108-year-old Alice Herz-Sommer. "I'm an optimist, for me it's only the good things, never a bad thought," she says.

Born in 1903, Mrs Herz-Sommer has managed to retain a positive outlook despite a horrific start to life. The oldest living survivor of the Holocaust, she was imprisoned in Terezin (also known as Theresienstadt) concentration camp, near Prague, with her young son Raphael.

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