I've only experienced this right after high school, college and PhD graduations. These were long term goals that dominated my life. There was bit of emptiness

I've only experienced this right after high school, college and PhD graduations. These were long term goals that dominated my life. There was bit of emptiness once these goals were achieved. Plus there was a dispersion of the social communities I had lived in for long time. This emptiness did not last long as there were always new projects around the corner afterwords. I expect the same feeling after job "retirement" and expect it to last as long.