Morning jog with dad

Hmm... guess how old he is? He is 79 years old and turning 80 this June. This old man is so great. He loves to keep moving all the time. Look at him, when I go jogging in the morning, he wants to join me too. I jog for one hour without stopping, and he tries to do the same. The only thing is, he can't deny that he is already really old... but in his mind, he still believes he can do more than what's expected for his age.