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I would want to live to 120 if I was healthy, agile, mentally aware and in good condition. If I would never age past 50 or so but I could exist for 120 years it would be the most amazing thing to witness. I always wonder what it must be like for those who have lived somewhat healthily to 100. Bottom line is I don't want to live for ever, but I feel like life is too fragile and short.