Retirement simply means that you could just live off of your savings interest. But that doesn't mean that you have to stop working.
For me, this is about three things: 1) Prioritizing joyful experiences, social connections, self-development and happiness over (expensive) material possessions 2) Being financially responsible, knowing how much I earn, owe, spend and save 3) Maximizing future life options involving less well-paying jobs (working part-time, retiring, taking some time off, starting a new career, whatever) when I get bored/burnt out of my current career or get health issues, need to look after a family member etc. So much can happen in a life.