In short: The moon goes from new to full to new in about 29.5 days. The age you see is how “old” this moon is (so full moon would be around 14.75 days)
This definitely got me stumped, as coincidentally … the watch is also around the same age when I first got it, but knew it couldn’t be that … but yeah, age of the moon phase does make a whole lot more sense. hahaha
and thank you Lucky.Andrei for moving this to the correct board / category. Appreciate it.