Bloating is generally the result of not being able to properly digest foods. These not-so-digested foods feel like they're just sitting around causing discomfort and a general feeling of being stuffed and “gassy”.
It can happen at any age but if it seems to be more frequent as you're getting older it can very well be because of your stomach's reduced ability to produce enough acid for proper digestion.
Normally, when we eat cells in our stomach release more acid which is important for so many digestive processes like breaking down foods and activating enzymes. As we age this process can become less efficient and the result can feel like it's wreaking havoc on the rest of the digestive system.
Unfortunately, this can have wide-ranging effects on all of our digestion abilities “downstream” and that can result in bloating.