Definition of advanced adjective from the Oxford Advanced American Dictionary

Oxford3000

advanced

adjective
/ədˈvænst/
 
 
1 having the most modern and recently developed ideas, methods, etc.advanced technologyadvanced industrial societiesSweden has a reputation for advanced and stylish design.2 (of a course of study) at a high or difficult levelThere were only three of us on the advanced course.an advanced student of English3 at a late stage of developmentthe advanced stages of the diseaseIDIOM

of advanced years

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someone's advanced age

used in polite expressions to describe someone as “very old”
He was a man of advanced years.(humorous)Even at my advanced age, I still know how to enjoy myself!of advanced years