Started a game as Ieyasu and had the heir come of age at 14, which I was very happy about (is it random in this mod?). Zoned in and played for a while, and he's 20 now, which made me look and find that there are only 4 turns per year, which would make Ieyasu die of old age fairly quickly. I'd like to avoid this - how can I make TPY 12 or something?