LO 7.0.5.2 on Win7
The other filters work on a selected photo, but not Aging and Smooth.
I have searched high and low for reference to this issue and have found none. Much less the solution.
Perhaps you can help, though. 
If so, please do.
Thank you,
Mark
PS: Yes, I have tried on multiple photos and in multiple documents.
Maybe it depends on the type (bmp, jpg, etc.) of the images?
I cannot see a difference for either high or low resolution jpgs for either Ageing or for Smooth with small or large settings either. Tested also by using undo to instantly show difference; no effect. Compare to Sharpen which has a very coarse effect. Remove Noise might be a substitute for Smooth. Windows 10 20H2 LibreOffice 7.0.5.2
I would always use an image editor such as GIMP for editing bitmaps so I have never used the filter before.
It’s a bug tdf#117750