I saw there was a similar request few years ago (http://meta.stackexchange.com/questions/83717/badge-suggestion-badge-for-being-active-member-for-3-or-5-years) and I din't know how to bring that forward again. 

I think is just natural extension to have a gold badge that rewards long time commitment much like the silver `Yearling` badge does.

**Lustrum badge will be given to people that have over 5 consecutive `Yearling` badges and have an overall score over 5k** (or 3k or 10k the best amount could be decided here). In any case the score should be higher than the 1k that is necessary for the 5 consecutive `Yearling` badges. 

The badge could look like this:

[![enter image description here][1]][1]

I went for the word lustrum since I think it sounds good(at least better than [semidecadian][2] or quinquennium) and represent 5 years in one word.

[![enter image description here][3]][3]

Also **this could be awarded multiple times** much like `Yearling`, thus in 2018 there could be people that have two `Lustrum`  badges.

This question was moved as an answer [here][4]


  [1]: https://i.sstatic.net/AGoyN.png
  [2]: http://meta.stackexchange.com/questions/196659/any-thoughts-on-a-semidecadian-badge-for-people-with-five-years-service-and-an-a
  [3]: https://i.sstatic.net/ArKoM.png
  [4]: http://meta.stackexchange.com/a/274392/192821