Is pool lifeguarding an age-appropriate job at 30?

I used to be a lifeguard as a teenager. Now at 30, I am unemployed and collect disability benefits. I used to be an EMT and a software engineer, but the tech job market has been destroyed and I cannot return to healthcare/public safety due to some trouble I got into about 10 years ago.

I am receiving $1,800 a month with SSDI, but I am allowed to make a certain amount of additional income a month, as long as I don't exceed a certain threshold (I think around $1,200 a month).

Would pool lifeguarding be age-appropriate for a 30 year old? Some places around here are offering free courses with certification.

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Is pool lifeguarding an age-appropriate job at 30?
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