Final answer:
The provided information does not contain the specific Pew Research Center survey from 2009. The mean age of 60 likely belongs to a group within the ranges of ages 55-59 or 60-64, but the available data does not allow for a precise determination without the actual survey details.
Step-by-step explanation:
The Pew Research Center survey from 2009 you're referring to does not seem to appear directly in the provided reference materials. However, based on the context of the given information and standard demographic categories, the mean age of 60 would most likely apply to the ages 55-59 or ages 60-64 group. Since neither of these specific age ranges align exactly with any of the response options provided and the actual survey from 2009 is not cited in the references, it's not possible to definitively determine which group of respondents had a mean age of 60 based on the information provided.