We have to delete the old files in this folder.

[Sureshvemuri]

"We have to delete the OLD files in this folder."
We have to delete the OLDER files in this folder.
Here, is the usage of OLDER correct or wrong?
When we use OLDER , should we use THAN as a must?
Thanks,Suresh

[Mister Micawber]

.
These are both fine:

We have to delete the OLD files in this folder.
We have to delete the OLDER files in this folder.

They may or may not refer to different files in a given folder.
.
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Native English teacher at Mister Micawber's