Hi Higi.
Unless a true medical need (not sure how bad your incontinence is) I wouldn't bring this up to your parents, if you are 28, as it suggests.
This could cause much unnecessary worry for your parents etc.
If however, if a true medical condition, and you really need the protection, Making life harder if without, then I see it totally fair to discuss with your family and see if they can help you either get it checked out with a healthcare professional, or at least help you pay for them.
True adult incontinence products would probably be more appropriate, rather than youth pull-ups... just my thoughts.
A.