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Disease does not respect the age.
The symptoms may be similar - yet the diseases could be very different.
If your father has the same problem, it may be an inherited disease - like familial Polyposis.
If the duration is short, it could be infection or infestation
If it is long, it may be Irritable Bowel Syndrome
, Crohn's, Ulcerative Colitis
and so on.
Consult a Gastro-enterologist / Have a colonoscopy
done - proper treatment needs proper diagnosis. Often investigations are required to diagnose.
Wishing speedy recovery