The theory that is being described here about Eleanor is what is known as the disengagement theory.
The disengagement theory is a theory that teaches that it is inevitable for a person to age and that aging leads to withdrawal syndromes.
According to the theory, as a person ages, they would begin to have a decreased relationship with the social circle that they used to be a part of.
This theory is true in this case because that is what is happening to Heather. She has reduced her involvement with her circle and withdrawn from volunteering.
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