The year is 2120, and the world is (depressingly/refreshingly) similar. Sure, techonology has advanced and there are flying cars, trains run through voided tunnels at 1000 mph and scramjets take the rich from Canberra to New York in 2 hours, and our virtual personal assistants ("Jeeves") often appear smarter than their owners. The unemployment rate hovers at a steady 70%, but with all the automation and the universal guaranteed personal income, that's not as terrible a thing as one might think. True Artificial Intelligence has proven elusive, and after (what even later history books would call) the War of the Lesser Abominations, AI research is at this point forbidden across most of the civilized regions of the planet, and a well-funded AGI Taskforce roams the slumlands hunting out rouge AI developers.
The one notable feature of this world that I'm interested in for the purpose of this question is that most people can expect to live to 200 years, with life expectancy growing at just under 1 year per year for much of the past century. Dementia, cancer, heart disease are quaint things of the past century, with suicide, accidents, and engineered viruses now the largest killers by far.
What would the implications of a 200 year lifespan be? I'm thinking specifically:
a) Career - would getting multiple phds become the norm for a well-educated member of the body economic (a.k.a. any employed person)? Would career progression be stifled by dinosaurs that won't retire or would innovation be instead boosted by the extra willingness to devote a decade or two to a risky project?
b) Family life - would dating one's grandchildren's friends be regarded as normal, and would marriages become limited-duration contracts?
c) Is there anything major that I'm overlooking? Yes, I'm aware of the concept of undying tyrants, and will not be pursuing it directly here.