Thank you for your question. My name is XXXXX XXXXX I will be happy to help
Your wife is free to select the spousal benefit at her full retirement age, and defer her payment until age 70
Whether or not she can defer benefits depends on her age - she could not take the spousal benefit prior to full retirement age.
But, once she reaches 66 she can file and draw spousal benefits and allow her own to grow to its max at age 70
All of this despite me filing 1 year before my full retirmenet age?
Yes, your age doesn't matter.
She will just get 1/2 of your reduced benefit, is all.