Crossword Genius

Describing one with the most experience of life (6)

Ross

I believe the answer is:

eldest

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'life' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for eldest that I've seen before include "Most advanced in years" , "Most old" , "First in the order of birth" , "Firstborn; led set (anag.)" , "Most aged" .)

I've seen this clue in The Globe and Mail and The Irish Independent.
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