Spousal Social Security

Terry:

If my 69 year old wife begins collecting her social security (about $900 / month) now:
1.) Will she be able to collect a portion of mine when I begin taking mine at age 70 (about $3700 / month then)?
2.) If she switches from her’s to mine when I begin collecting, is my benefit reduced?

Thanks in Advance!

Kevin M. Walker

P.S. I listen to you at Noon, Wednesdays on WGN and I read your column in the Chicago Tribune