My little 12 year old mini pinscher dog Roxy playing fetch with my sock

I just came back from a trip unpacking my bags and this little girl just wants to play fetch with anything. She grabs one of my socks and brings it to me so I just throw it to the other side of the room and start playing fetch with her! She will just keep going all day if I never stop! She is 12 years old and so energetic!