I don't want to live longer... The human body and mind can only take so much.
By the time you reach current end-of-life ages, existence itself is exhausting and you no longer have the ability, desire, or energy to explore the world, pursue dreams/goals, or do much of anything productive (for yourself or the society you're a part of); while struggling to overcome the years of aches and pains your body has acquired.
At that point, you're just along for the ride, waiting for it to bloody end already.