As cats get older they may start to change their behavior or develop what we see as cat behavior problems. But with the right diagnosis, treatment and some patience many of these problems can be resolved.
Urinating or defecating outside of the litter box is one of the main behavioral problems in elder cats. There are many reasons for this, including a possible medical condition, so be sure to have kitty examined by a vet for proper diagnosis. For more information see Cat Urination Issues Related to Cat Health Problems.