Since kids and the elderly have a bit of trouble opening tight caps, getting the Water=Life opener by Arik Levy will be a great idea.
The Water=Life opener was primarily designed to help young kids and seniors open up tight bottle caps. The accessory takes the form of a stone with an opening at the bottom with ridges that helps secure it in place. Simply connect the hollow end of the Water=Life opener to the top of the bottle and twist. This should provide the proper grip to enable the cap to pop open the security band that's usually placed in beverage packaging. From the looks of it, this is primarily used for water bottles, so it may not work for beer bottles.