Shawndalynn and MTSUGURL,
I am going to tell you that if you feel like going ZTA at an "older" age (*cough* *cough*), then go for it. Why am I saying this? I actually became a collegiate ZTA at 28.

(no, not married. no kids.) I go to Old Dominion University in Virginia. (Iota Sigma, 208th link!!)
But like previous advice, it is going to depend on where you go to school, the chapter, etc. I was up front with my new sisters about my age. Never lied about it! I made jokes about it.
There were times it was difficult associating with my pledge sisters, but I wouldn't change a thing. I love my Alpha Zeta pledge sisters. We Rock! They made it fun, my sisters made it fun. Let us know what you end up doing!!!