1. having lived or existed for the greatest amount of time; most advanced in age
Usage: superlative form of ‘old’
2. having existed for the longest time; most ancient or long-established
Usage: used for things, institutions, or traditions

Examples

• She is the oldest child in the family.
• The oldest building in town dates back to 1650.
• My grandfather is the oldest person I know.
• This is the oldest university in the country.
• The oldest tree in the forest is over 500 years old.
• He’s the oldest member of our team.
• The oldest tradition in our family is the annual reunion.