Back to School College Dorm Room Shopping Haul 2020 ~ Jacy How ancient are Jacy and Kacy? The sisters have an age that is uncertain. The span of time they have experienced remains a closely guarded secret. Nobody knows the exact age of Jacy and Kacy. The sisters are inclined keeping this information private. You will find a definitive answer regarding their age. Rather, it is shrouded in mystery.