We started on the same day, at the same level, side by side. Now his title is two rungs above mine and I report to people who report to him. I keep replaying the years between then and now, trying to find the moment it split, and I honestly cannot see it.
More people experience this than they realize.
A peer you started level with is now far ahead, and you do not know why.
If this sounds familiar, the Library can help you find the bigger picture.