Do we really want flying cars when we're already terrible at driving on flat surfaces?
We have power plants that run on bio-methane instead of cars. Rail is more fuel efficient by far anyway, but Americans don't like going places on schedules not their own.
We solved the food production problem but forgot to tackle the human population growth one during the Green Revolution. Growth compounded by the diseases we've eradicated (smallpox) and nearly eradicated (polio).
As for the last, why do you want to live to be 100? You can probably be kept alive artificially for a long time, but your brain goes to pot with dementia, your joints give out, and your heart just gets tired. Medical science is working on all of these problems, but it's not cheap, easy, or quick work.