AOG
It's not an over-generalisation.
An over-generalisation would be this statement:
Young people are all left wingers.
However, it's true to say that left wing politics (and liberalism) is far more attractive to younger people.
In many social attitudes, younger people veer away from older people.
It's also true to say that older people lean more to the right than the left in many social attitudes.
Do you disagree with that?
Are you saying that the split is 50/50 in all age groups, or that all age groups veer to the left or right?