An intergenerational conflict is either a conflict situation between teenagers and adults or a more abstract conflict between two generations, which often involves prejudices against another generation.
Furthermore intergenerational conflict describes cultural, social or economic discrepancies between generations. These can be caused by value shift or conflict of interest between younger and older generations. An example are changes to an intergenerational contract that may be necessary to reflect a change in demographics.
For examples of intergenerational conflict, Dreaming in Cuban, by Cristina Garcia is a good novel to take a look at.