I took early retirement at 58, now 65. The working life was never for me and I'd spend 40 years trying to fit into a workplace designed for the neurotypical, not the neurodiverse as I apparently am. Having beaten myself up for not being good enough for all those years, an inheritance gave me the chance to take time away from the pressures of work and figure out what I was best suited to, and it turned out the answer to that was living for pleasure alone.
So that's what I've done for the last 7 years. I've taken up sports, learned musical instruments, languages, got involved in political causes, embraced dozens of hobbies, my social circle is wider than it has even been and I've finally known true, stress-free happiness which really makes up for all those years trying to fit in in a way which I now know was never going to happen.
My friends are intelligent, interesting and diverse, have non-"mainstream" jobs and no-one works standard rat-race hours, or judges me on my work but rather the person I am. At this ripe old age I have found my tribe and I've never been happier. I finally belong.
Re. the OP's financial question, it depends on how you want to spend your days. Hobbies can be expensive, but some can also be really cheap, or free. Inherited money with no other income doesn't last forever, and I've slowly been tightening my belt as money dwindles. But maybe it's the optimist in me, but whenever things looked dire financially, I'd tell myself that something would turn up, and you know what? Something always did.
I'm getting close to state pension age (to the PP who can't imagine life without contributing to the tax system, yes, I have done this, paid full taxes and NI and have earned a full pension) so I know in future there will always be a fixed amount coming in.
I'd recommend that everyone embrace the chance to lead a happy and fulfilling life in a way that works for them, and remember that no-one's big regret in life is not having spent more time at the office.