Some petrol derivative we all live to get (5)

I believe the answer is:

older

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'all live to get' is the definition.
I can't tell whether this definition defines the answer.

'some petrol derivative we' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'OLDER' is hidden within 'petrol derivative we'.

Can you help me to learn more?

(Other definitions for older that I've seen before include "More aged" , "Less young" , "Former" , "Increasingly mature" , "More senior" .)

I've seen this clue in the Evening Standard.

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