Which formal aging theory fell short of credibility due to lack of scientific data?

The answer is: Disengagement theory

Disengagement theory views that as people grow older, the amount of attachment that people have with society would tend to decrease, which tend to cause them to gradually decrease/withdraw their interaction with other people. Since there is no countable factors that can be used to measure this, it has lack scientific data to support it.

answer; when one group has an extremely high score at pretest;