How do I remove old sprints?

Hector Herrera

Every time that I will close an active sprint , the name of an old, unused sprint pops up as the first option. 

When I create a new sprint from the Backlog page, the name of another old sprint comes as the default name of the new sprint.

How can I remove them?

Thanks,

Hector

PS. This may be the same as another posting, but not sure that anybody is still looking at that one since it's from 2014: Old sprint showing as future sprint

https://community.atlassian.com/t5/Jira-questions/Old-sprint-showing-as-future-sprint/qaq-p/237308#U1355222