World of Methuselahs: What if lifespans increased to 1000 years

What kind of effect would a long lifespan (but not immortality) have on humanity? For example,

  • If the people from history were still around, history would move more slowly. The idea that Racism is acceptable in the Western world is decreasing/dead because younger people don’t think racism is okay (brought up that way with media and legal influence to ensure it) and the people who thought racism is okay are dying out. The morals/beliefs/stigmas of the past would still be present today even more than they currently are. I don’t believe that religion is BS but water nymphs and mermaids are. Likely some people who claimed to have seen them in the 1500’s would still be making that claims today.
  • The rate of technological increase would seem larger. This would mean that people who thought the cotton gin was innovative would be trying to learn how to use an Iphone. That would be the norm! Our greatest minds would have 100s of years more to study the universe and (assumed) the memory to support it. If anything the actual rate of technological increase would be faster. Nevertheless, this means that a large portion of the population would be left behind to only do manual labor unless continuing education becomes more significant. Expect to return to school for a decade every 100 years to stay on the cutting edge of whatever exremely nuianced area you are actually an expert in.
  • We would actually make things right! We wouldn’t build houses meant to last 100 years… we would construct them of stone.