In the mid 90s, we had Dan Jurgens' Teen Titans about a brand new group of teen heroes who ended up being mentored in some capacity by the veteran Titans. When that series was cancelled, it was replaced by Devin Grayson's Titans which featured a reunion of a classic Titans team.
In the early 2020s, we had Teen Titans Academy about a group of new teen heroes being taught by the veteran Titans. When that got cancelled, it was replaced by an adult Titans series featuring a reunion of a classic line-up.