Then that is the perfect time to go, you will get all new information, and not have to replace it with some of the old, not-always-right info that some Sorors like to impart.
Don't ever feel like you are too young or old in Zeta to learn new things. That goes for any org, really. Once you start feeling that way, your growth in said organization will stagnate, and you become an ineffective member, IMO.
ETA: and ZOL is new for every Zeta, so you shouldn't feel any more out of place than the next Zeta.