Robert Lagas
You misread/quoted the valid until date for the guy with multiple entry stamp and "pensioners" visa, it was actually the 27th not the 21st
TLDR : Answer Summary
The discussion clarifies the valid until date for an individual holding a multiple entry stamp and a pensioners visa, correcting it to the 27th instead of the 21st. The importance of keeping track of extension and re-entry permits is highlighted in the comments.