Prophethood was given to Prophet Muhammad (SAW) when he was 40 years old.
At the age of 40 years 6 months and 10 days, Muhummad was meditating in Cave Hira when suddenly Angel Jibraeel (Gabriel) came and tolh him to read. Muhummad was illeterate so he said he couldn't...
At the age of forty.
You can not choose to be a prophet, god must choose you, and he always chose simple uneducated people, many were shepherds, the lowest job then.
He became prophet because Allah chose him to be. ALLAH chose him over the people
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