I guess I can be considered a "lifer". Co-founded a startup nearly 10 years ago. Nowadays my job description can be considered "senior developer" with no manag

I guess I can be considered a "lifer". Co-founded a startup nearly 10 years ago. Nowadays my job description can be considered "senior developer" with no managerial responsibility (my choice). The job has a social impact, pays more than enough for my modest standard of life (lower than market rate, but that's expected for a job in a social impact startup, and I'm at peace with that), colleagues are nice, boss is bearable, and short of the company failing, I can't really be fired. The job is also interesting, with new challenges all the time. Long story short: it's the right situation for me, and I know for a fact the grass is not greener elsewhere.