When to take social security

I retired at the end of 2021. I am 67 and plan to defer taking social security until I turn 70. I have sufficient funds in my retirement accounts to support myself and my wife. I am in fairly good health but do have several chronic conditions. My wife is also retired but is 4 years younger and is taking her social security. I want to maximize my benefit and also her survivor benefits by waiting until 70. Is that the right strategy? What should I consider