The commonality of the attitudes of Leena's parents' generation most likely exemplifies the cohort effect, which is associated with time and experiences.
The term cohort effect is used to refer to the common traits and behaviors shared by those who were born and lived through the same or similar:
According to the situation described in the question, Leena's parents as well as their friends are baby boomers. That means they show certain characteristics in common because of the experiences they shared growing up.
Suppose you and a friend of your were born in the same year and had to experience an economic recession during your teenage and young adult years. You will most likely present certain traits and behaviors in common, precisely because of the shared experience in life. That is the cohort effect.
Learn more about the cohort effect here:
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