Good question
Most of the debates are due to there being no exact boundary between the Pisces and Aquarian constelations. Some feel it started in the 1900 and others say it won't start until 2500. Each age varies because the constelations are not all the same size, but on average it is about 2100 or so years. Some of the web sites might help you find the answer.
http://www.adishakti.org/age_of_aquarius.htmhttp://en.wikipedia.org/wiki/Age_of_Aquariushttp://www.accessnewage.com/articles/astro/ageaq1.htmhttp://www.greatdreams.com/ages.htmPersonally, I think we are just beginning the Aquarian Age. One site I saw said each age focused on some type of human development, such as literature, science and such. So far our focus has been technology.
any one else have any suggestions?