From my data, it's mostly 25 to 35. So they leave after graduating college and presumably come back after 35 to settle. That might change though as it's only be

From my data, it's mostly 25 to 35. So they leave after graduating college and presumably come back after 35 to settle. That might change though as it's only been a decade that people have been doing this (and only a few years on massive scale).