Here are the key similarities between the first stage of infancy and the last stage:
- Both stages involve helplessness and total dependence on others for care.
- Physical weaknesses are prominent - in infancy due to underdevelopment, in old age due to deterioration of senses and abilities.
- Loss of abilities to perform basic functions independently - an infant cannot feed itself while an old man may lose abilities like eating without help.
- Regression to childlike qualities - an infant's cries and an old man's childlike voice.
So in essence, both mark periods of complete reliance on others and physical/mental weaknesses, with life coming full circle from the beginning to the end.