Senior meaning

an undergraduate student during the year preceding graduation

a person who is older than you are

older; higher in rank; longer in length of tenure or service

“senior officer”

used of the fourth and final year in United States high school or college

“the senior prom”

advanced in years; (`aged' is pronounced as two syllables)

“aged members of the society”

“elderly residents could remember the construction of the first skyscraper”