Meaning of "life time of experience..."

[Alex M.]

English Language Tests, Intermediate level

ESL/EFL Test #74 "Christmas Postman (1)", question 5

With a life time of ......... in doing all the walks in the town.

(a) experience
(b) knowing
(c) habit
(d) custom

English Language Tests, Intermediate level

ESL/EFL Test #74 "Christmas Postman (1)", answer 5

With a life time of experience in doing all the walks in the town.

Correct answer: (a) experience
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What does this sentence mean with other words?
Thanks in advance

Alex

[Alan]

Hi Alex M.,

This means he had had experience for a long time (a life time) of posting letters in all the houses on the different routes (the walks) of the town.

Alan
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English as a Second Language
You can read my ESL story Colour Idioms