senior

You can use the word senior to describe anyone who's older than you are. You might say, "My brother is six years my senior," especially if you want to make him feel old.

Senior means "older," but it also means "old or aged," like your grandmother, who despite being a senior citizen, continues her skydiving hobby. A senior is also a student in the final year of either high school or college, or an authority: "She holds a senior position in the State Department." The Latin word senior means "older," and it's the basis of respectful terms in many languages, like señor in Spanish and sire in French.

Definitions of senior
  1. adjective
    advanced in years; (`aged' is pronounced as two syllables)
    senior citizen”
    synonyms: aged, elderly, older
    old
    (used especially of persons) having lived for a relatively long time or attained a specific age
  2. adjective
    older; higher in rank; longer in length of tenure or service
    senior officer”
    Synonyms:
    old
    (used especially of persons) having lived for a relatively long time or attained a specific age
    elder, older, sr.
    used of the older of two persons of the same name especially used to distinguish a father from his son
    major
    of the elder of two boys with the same family name
    precedential
    having precedence (especially because of longer service)
    higher-ranking, ranking, superior
    having a higher rank
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    Antonyms:
    junior
    younger; lower in rank; shorter in length of tenure or service
    immature, young
    (used of living things especially persons) in an early period of life or development or growth
    junior-grade, lower-ranking, lowly, petty, secondary, subaltern
    inferior in rank or status
    minor
    of the younger of two boys with the same family name
    jr., younger
    used of the younger of two persons of the same name especially used to distinguish a son from his father
    subordinate
    subject or submissive to authority or the control of another
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  3. adjective
    used of the fourth and final year in United States high school or college
    “the senior prom”
    synonyms: fourth-year
    last
    coming after all others in time or space or degree or being the only one remaining
  4. noun
    a person who is older than you are
    synonyms: elder
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    types:
    dean, doyen
    a man who is the senior member of a group
    doyenne
    a woman who is the senior member of a group
    type of:
    adult, grownup
    a fully developed person from maturity onward
  5. noun
    an undergraduate student during the year preceding graduation
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    type of:
    undergrad, undergraduate
    a university student who has not yet received a first degree
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