This topic will always be alien to a lot of people around you, because it shakes the foundations of our consumption society. In general, people have too many beliefs to overcome before starting to believe in FI.
So, instead of convincing with arguments, lead by example. For instance, I know that I made thinking a friend very hard when I mentioned that if I stopped working now, my emergency fund would be enough to cover at least three years. (It was last year and I had started my journey for a little more than one year). In general, as soon as you grow your stash to levels not commonly seen, people will start thinking by themselves.
To come back to your first question, I would say it is definitely possible. I am currently in my early thirties and I plan to retire around 40.
However, it depends a lot on your numbers. Like everywhere else, housing, healthcare, transportation and food (and kids) are the main costs, so it is important to optimize them as much as possible. For instance, if your housing costs more than 20% of your after-tax household income, your saving rate will be badly impacted.
It would help if you could publish your post of expenses, so we could perhaps give you some pieces of advice about how to reach your financial goals