Hi,
It seems that, in Moodle documentation, you can not see changes older than 60 days.
It's sometimes usefull when you remember having seen an interesting change, but don't remember on which page exactly, nor when.
For exemple, if you try latest french changes in latest 1000 days (and 1000 changes), you'll only see latest 60 day changes.
I had such a request some years ago, reported in this discussion, and in MDLSITE-969.
Séverin