Try to think of ways that the three age groups would view the same thing about the commerical mall....
For example, the signs --- font size and font type (young people may be able to read the fonts, but older people may have difficultly); the building and landscape-- young people may not see the use of nice landscaping and building, but adults will; security guards, parking, expected mother's parking, floors (anti-skid, etc), layout (multiple stories v. one story; steps v. escalator or elevator).
Hope that helps! Good luck!
Constance, EssayForum Contributor