are the ones that happen suddenly, like people disappearing and appearing in your life, or moving and just whole new experiences.
and the ones that happen so slowly you don’t notice them. like running every other day. when i was young i was totally out of shape except for the football i played. i’m not even sure what the motivation is anymore, i just ran more and more and more and now i’m healthy.
the worst ones are the ones that are fast enough to be hard to keep up with, yet slow enough to be worth keeping up with.