when is age 8 to file the affidavit

You do not file until the school year AFTER her 8th birthday

For example if your child turns 8 during April of 2010, your first filing year is 2010-11 school year.

Go here and click on FAQs!

http://www.pde.state.pa.us/home_education/site/default.asp

When do I need to file an affidavit?

You must file an affidavit for each child you will be homeschooling when he or she is between the ages of 8 to 17. (24 P. S. 13-1326 - compulsory school age) You must file an affidavit when you begin the home education program and annually thereafter by August 1.

If your child turns eight before or during the first two weeks of the annual school term, or within the first two weeks of the second semester, if the school district in which you reside promotes students semi-annually, the affidavit needs to be filed by the child's birth date. If the child turns 8 during the school term, the affidavit should be filed prior to the beginning of the next school year. (24 P.S. 13-1304 - admission of beginners). If the child has attended any school in grade 1 or above, you must file an affidavit whenever you begin homeschooling, regardless of the child's age. (24 P.S. 24 13-1326)


So, that is directly from the Dept of Ed in Harrisburg. Look to the Dept of Ed for answers on homeschooling, not your local school district.