Does a wolf's age affect its chance of dying?

Yes, for each year over 15 they will have a higher chance of dying in the death script.

Does anyone know when the moon phase changes?

The game alternates between day and night every hour at ##:00. The moon phase is random but the chances of a full moon are significantly higher in August because full moons affects aspects of August's explore event.

Ohh okay, thank you so much!