✔ 最佳答案
1.an elder長者
2.a senior 前輩
3.a member of an earlier generation上一代的長輩
4.an elder member of a family 家中長輩
5. condisciple 同學,師兄弟 (但這字眼卻是法文,英文是沒有這字眼的)
6.fellow alumni 畢業校友
1 to 6 都不合用。
勉強可用的是 senior fellow classmate(s) or senior fellow alumni (母校中的學長或校友、比自己早屆別的師兄師姐,老外對此是不分性別一般叫法)
香港俗稱警察學堂內亦引伸借用上述情況。
參考: my 40 years experience with foreigners