I think 80 is an often forgotten milestone. The every 10 milestones in any league, relationship, career, or similar often come with mild celebration. This is because while it is something to be proud of, it comes around as the fastest of milestone criteria, the others being 25s, 50s, and 100s, and generally the longer you go between milestones the bigger the celebration is. Because of this, the milestones at 30 and 80 tend to end up feeling excessive or forgotten as a 25 milestone was recently hit and generally comes with a large celebration.