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All answers having "Old man" as clue:

3 Character Answers:

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DAD

POP



4 Character Answers:

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PAPA

POPS

THIS



5 Character Answers:

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DADDY

ERNST

HUBBY

POPPA

RIVER

VIEJO



6 Character Answers:

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ALMOND



7 Character Answers:

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HUSBAND



10 Character Answers:

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FATHERTIME



11 Character Answers:

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HOMOERECTUS

NEANDERTHAL