Comment by Kamil Maciorowski on how to delete all files that are old then X days and ended with number/s

-name '*[0-9]' is fine. The files in question were modified on August 7, some on August 5. The question was posted on August 8; at that time -mtime +6 did not match any of the files. Now I wonder how the accepted answer helped you, so you did accept on August 9, when -mtime +6 still shouldn't match.