If you earn enough money to live on for the rest of your life, you can retire earlier and enjoy your life. However, you should be beware of not developing bad habits or activities such as gambling, drug addiction because they will have negative impact on your health, family, ect and eventually it will result in bankruptcy.
If we save a little then we can retire earlier. To calculate, one's retirement number is what one needs per month multiplied by 300. For example, if I can live on $2k per month then my retirement number is $600k. When one reaches their goal then they can retire and live off the 4% interest. If we save a little then we can live happily ever after!