Older dog...Forgotten potty training???

I have 13yr old male Siberian Husky.  As of about 6 months ago he started going to the bathroom in the house.  He only poops in the house.  He will ask to go out when he has to urinate.  I know 13 is old for a larger dog and he has NEVER had house training problems before.  He has even pooped on the floor while I was putting his leash on to take him for a walk.  Is he senile?  Any suggestions?

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