The physical and mental requirements for youth and age are as wide apart as the two poles. As reminiscence characterizes old age, so enjoyment of the present typifies young age. The Bard of Avon has thus compared their physical and mental characteristics:
Crabbed age and youth,
Cannot live together;
Youth is full of pleasure,
Age is full of care:
Youth like summer morn,
Age like winter weather;
Youth like summer brave,
Age like winter bare;
Youth is full of sport,