I just bought a pair of jeans and they have a weird, almost old people smell even...

Try adding a cup or so of white vinegar to the rinse cycle. It won't damage the color or the fabric and it works fantastically to get odors out of clothes.
I add vinegar to almost every load of laundry I do.
And I give you my word, once the clothes are dry they do NOT smell anything like vinegar. :)
 
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