“因年久”可以翻译为 “due to the passage of time” 或者 “because of long years” 。例如：
The building is in a dilapidated state due to the passage of time.（因年久，这栋建筑已破败不堪。）
The old painting has faded because of long years.（这幅古画因年久已褪色 。）