Delete files older then X day.. BUT not by date modified - batch-file

Question

I have a config file for an .exe my workplace built where you can specify deleting of files (specifically retaining the last say 30 days files in my test here [logs and sql are fine]) and it even clears out sub folders. however it is deleting by date modified, so newer folders with some old remnents of data are getting the old remnents deleted.
Folder1:
File: Modified:
File 1 2018/02/02
File 2 2010/05/06
File 3 2018/02/01
Folder 2:
File: Modified:
File 1 2011/12/30
File 2 2006/01/16
File 3 2018/02/02
Would leave:
Folder1:
File: Modified:
File 1 2018/02/02
File 3 2018/02/01
Folder 2:
File: Modified:
File 3 2018/02/02
Is there anyway to change this so it retains the last 30 folders and contents,, deleting everything else?
This is the contents of the "cleaner".exe.config file I have:
<?xml version="2.0" encoding="utf-8"?> <configuration> <configSections> </configSections> <!-- Make sure that every new location has a name with an increasing number e.g clear 1 -->
<appSettings>
<add key="connstring" value="Data Source=localhost;user id = *****;password = *****;Initial Catalog =Database;" />
<add key="sqldays" value="180" />
<add key="LogLocation" value="C:\File\Logs\Cleaner\" />
<add key="clear" value="C:\Directory\Logs,90" />
<add key="clear2" value="C:\Directory\CSV\Backup,30 " />
<add key="fileExtensions" value=".txt,.csv,.log,.fmt,.hdr,.Log" />
<add key="ClientSettingsProvider.ServiceUri" value="" /> </appSettings> </configuration>

Answer 1

Just to close this out it didnt matter about the modified date, the files just needed to 'be gone' so I added a few more directories to the config file and let it loose.
Example:
<?xml version="2.0" encoding="utf-8"?> <configuration> <configSections> </configSections> <!-- Make sure that every new location has a name with an increasing number e.g clear 1 -->
<appSettings>
<add key="connstring" value="Data Source=localhost;user id = *****;password = *****;Initial Catalog =Database;" />
<add key="sqldays" value="180" />
<add key="LogLocation" value="C:\File\Logs\Cleaner\" />
<add key="clear" value="C:\Directory\Logs,90" />
<add key="clear2" value="C:\Directory\CSV\Backup,30 " />
<add key="clear3"value="C:\Directory1\CSV\Backup,30 " />
<add key="clear4" value="C:\Directory2\CSV\Backup,30 " />
<add key="fileExtensions" value=".txt,.csv,.log,.fmt,.hdr,.Log" />
<add key="ClientSettingsProvider.ServiceUri" value="" /> </appSettings> </configuration>