Questions and answers are and should always be edited, this gives the community the possibility to update their contents and improve the information provided.
A fail-safe exists to prevent misleading edits:
![enter image description here][1]
Every edit even years later generates a notification to the owner (at least I receive them).
The notification informs about the edit that was made and provides a link to the edited question. This should be more than enough to alert the owner, thus taking appropriate action if deemed necessary:
- rollback the edit
- flag the edit to moderator ♦ attention
Frozen answers / questions are not a good way to involve the community to work towards the greater good.
For completeness, editing 'bumps' the question to the front page, thus ensuring peer review for status and updates. [1]: https://i.sstatic.net/gCEP3.jpg