I only would like to keep the Access Logs of the last n days created by Tomcat Access Log Valve. http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Access%20Log%20Val
For Tomcat 7 you can config tomcat/conf/logging.properties. Example:
tomcat/conf/logging.properties
1catalina.org.apache.juli.FileHandler.maxDays = 90
Note: that 1 is not a typo.
1
https://tomcat.apache.org/tomcat-7.0-doc/logging.html