How about Pats/Rams with the Rams representing generational change vs the old guard? 23 year old QB with a 32 year old coach vs 41 year old QB with 65 year old coach that's been around forever.
Very fairly in sports do you get to see an actual intersection like that take place on the field/court. Usually the way it just kinda happens is teams/players get old and new ones replace them but there is never really an actual passing of the torch or showdown where this plays out. And a lot of times when it does, it's not really at the highest level and/or it just sucks (something like Ali/Holmes for instance)