Verein für Deutsche Schäferhunde (SV) e.V. Verein für Deutsche Schäferhunde (SV) e.V.

To which age can I be active in dog sports with my German Shepherd?

That depends solely on the physical constitution of the dog.

A German Shepherd wants to have exercise also at an advanced age, even though it certainly needs to be made sure that the dog is not overloaded.