What is walter peterson age?

As an AI language model, I do not have access to real-time information about Walter Peterson. However, based on available information, Walter Peterson was born on September 19, 1922, and passed away on June 1, 2011. He was 88 years old at the time of his death. He was a prominent American politician who served as the Governor of New Hampshire from 1969 to 1973 and again from 1975 to 1979. He is well-known for his political and social contributions during his tenure.