This is a humorous exaggeration of a common saying used by parents and grandparents to emphasize the difficulties they faced growing up. The saying is meant to convey the idea that the older generation had to work much harder and face more challenges than the younger generation. It is not meant to be taken literally, but rather as a way of expressing nostalgia for the past and highlighting the resilience of earlier generations. While it is possible that your father did face some difficult challenges growing up, it is unlikely that he actually walked uphill both ways or was nearly mauled by a bear every day on his way to school!
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