Yeah I've noticed it. There's several reasons I think, some good and some bad:
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upbringing
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can't be bothered in their old age
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losing eyesight causes them to miss seeing drops after the fact
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wrinkly plumbing tends to make fountains instead of streams
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can't bend to clean up, because of bad backs/legs
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shaky hands and bad aim if very old
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revenge for not cleaning up after your messes when much younger? 😂