That does little when they look at your resume and see when you started working, when you graduated from college, etc....
The year I graduated college I was 22 years old, so it is very clear that I must be at least that age.
Also, most applications ask for your birthday and full info on the application. No real way to get around that other than present yourself as enthusiastic and full of energy and hope they don't care what your age is.
Dawn
I've been laid off from two different jobs in two different economies - late 90's, and late 00's. The first time, I had a job in six weeks; it was really the first valid interview I went on (first one, the employment agency sent to interview for a job I truly wasn't qualified for, but the interviewer was very helpful).
Last time, with everything so different, I took advantage of all the seminars, classes, etc., the unemployment division offered. One tip was, as crisi indicated and someone else supported, to only go back about ten years on your résumé if you're 'of (or beyond) a certain age', thus competing with a younger, less costly pool of potential competitors. Mine actually goes back twenty years to show the range of jobs I've held (just four, counting this one) and my adaptability.
Did I mention I was in my middle fifties the second time (or my middle forties the first)? I know I live in an area with more opportunities than the OP has. Still, it took me longer to find a job the second time. The position I was ultimately hired for had nothing to do with anything on my résumé, although it related to my job back in the early 80's (one of the omitted jobs).
Anyway. Of the twelve people who started with this company that fateful day, two were over forty, and I of course was the old lady at fifty mm-mm. The first person to quit was one of the youngest, a twenty-something college graduate. After two and a half years, there are three of us still with the company - one late twenties, one forties, and me.
So it's not always us older, experienced, higher-earning hirees who are the ones using that company as a stepping stone...although two of us have transferred to other jobs
within the company.
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While the poster whose brother is living with her didn't ask for advice, this is, after all, the DIS

. Unless there's a good reason he can't (and you would know, I'm not asking),
make him get his GED. He won't support himself if you're supporting him, and you're right - he can't get even a basic job as a high school dropout.