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The oldest cast member in the film Eighth Grade (2018) at the time of filming was Frank Deal.
He was 58 years old at the time of principal photography.
For context, the lead adult actor, Josh Hamilton (Mark Day, the father), was 48 years old during the July 2017 filming.
The summary could have mentioned other older cast members for comparison, such as Deborah Kara Unger (Mrs. Nolan, 51) or Greg Crowe (Principal McDaniel, ~52), to definitively show Frank Deal was the oldest.
The oldest credited cast member of Eighth Grade (2018) was Frank Deal, who played Officer Todd. Born on October 7, 1958, he was 58 years old during the film's production in July 2017. He is older than other adult cast members such as Josh Hamilton (48), Missy Yager (49), Deborah Kara Unger (51), and Greg Crowe (~52).