This is the 6752nd most frequent Chinese word.
歲姓陳
"歲姓陳" is not a standard term or phrase in Chinese. It may be a combination of characters meaning "age/surname Chen."
The phrase "歲姓陳" here combines information about age (歲, meaning 'years old') and surname (陳, the last name in question).
陳女士今年四十歲姓陳。
Ms. Chen is forty years old and her last name is Chen.
"歲姓陳" is split across the sentence, with "年歲" implying age and "姓陳" identifying the surname Chen.
我們班的同學中，有一位姓陳且年歲稍高。
Among our classmates, there is one whose last name is Chen and is slightly older.
"歲姓陳" in this context relates to the elderly age (最年長) and the surname (姓陳).