The /mir (mirror) switch conflicts with the /mov (move) switch. Try this instead.
robocopy C:\Temp\src C:\Temp\dest /mov /e /minage:63 /zb /COPY:DATSO /r:5 /w:5 /l
The /l switch will perform a "whatif" operation and show you what it would move, but not actually do a copy.
/e will tell robocopy to process subfolders.
Pick one subfolder and test with that first. Run it initially with the /l and review the output. Then run it without /l and verify that the files you expected to be moved were in fact moved and that the permissions look correct.
Permission inheritance on the destination folders may affect the final permissions.