Generation Gap 

When someone has a big gap between their front two teeth. E.g. Michael Strahan

Did you see that girl's generation gap? Man it was huge.

Generation Gap by f the police October 30, 2010

Generation gap 

In today's usage, it refers to a perceived gap between younger people and their parents or grandparents.

Generation gap should have been solved in the future

Generation gap by Ryan900USAYT January 6, 2023

generation gape 

(v.) -- to gaze stupidly or in open-mouthed surprise or wonder at someone from another generation for doing or saying something completely surprising or incomprehensible due to the generation gap.

"Whenever I say something old-fashioned to my teenage sons, they just look at me in a totally befuddled way and then generation gape at me in wide-eyed wonder. 'Oh Dad, please!' is what they are thinking, I'm sure!"

generation gape by PRwiz101 March 15, 2012

Generational Gap 

When your sister posts naked pics of herself on the internet, then claims you don't understand the industry she is in.

-Hey Fred, out in L.A., we use those pics for our industry, you just don't understand! There must be a Generational Gap.
-But Rebecca, you work in Social Media!

Generational Gap by LACool July 28, 2018