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Living to 120 is becoming an imaginable prospect
(www.economist.com)
This is a most excellent place for technology news and articles.
Also to respond to your example - yeah, I reckon seeing civilization repeating the same dumb patterns every hundred years would get boring fast. "Oh, facism is on the rise again, better grab the popcorn".
In my country there are people who are still alive who lived during a military dictatorship and I cannot imagine of all things that they would be bored by its resurgence. The ones I hear speaking in the media seem livid if anything.
I could see someone ending their immortal life out of desperation, but boredom? Only if they completely give up on themselves and the world. Even that sounds like a treatable form of depression.
And that's not even bringing up all the technology and arts that advance every day. In the most mundane sense I could think of several franchises I'm constantly waiting on the next entries, without mentioning all that I haven't yet tried and ones that haven't even been invented that I might like.