I felt years really didn't make sense with whole Alvith not having any time concept beyond day and night really. So instead I will do it by ages and age is just gonna be the time period of a chiefs rule. Just didn't really fit the whole year at the top. Once the Alvith eventually come up with a form of measurement of time and have years will include years. For now it's just 'Age of -chiefs name-' but in future will be 'Age of -chiefs name- Year ###'.
I might not even bother with time keeping myself because the other players usually have different paces anyway. Not sure what I'll do about tech advancement though.