adjective
describing the state of being older or having lived for a long time
preposition
showing the relationship between 'advanced' and 'age/years'
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The elderly gentleman was advanced in age and required assistance with walking.
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My grandmother is getting up there in years and doesn't move as quickly as she used to.
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That old dude is really up there in age, man.
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The ancient oak tree was advanced in age, its branches showing the passage of many years.