This is the basic info given by Squaresoft's Strategy guide  about Aeris:

A beautiful 22-year-old, Aeris is a bright spot in the middle of a dark and dreary town. While selling flowers near AVALANCHE's first target, Aeris' life was forever altered after a chance meeting with Cloud. Because of her mysterious background, Shinra has pursued her for most of her life. Now she must fight against those who would enslave her and destroy what she holds most dear. Aeris is the closest character Final Fantasy VII has to a dedicated magic user. Her physical attacks are fairly weak, but she possesses great skill with Materia and its various forms.

Birthday: Feb 7 Age: 22 Height: 163 cm Blood Type: O Place of origin: Unknown Weapons: Rods