As we age, it may become more difficult to digest vegetables.
These make gas...broccoli, cauliflower, cabbage, brussel sprouts, onions, etc... and eating alot of them during the holidays, can be problematic.

Taking Beano before a meal with these can help.

Also some people have Candida yeast in the bowel, from previous use of antibiotics. This feeds on sugar and white carbs, and produces gas. The way to deal with this is to starve the yeast. Avoid sugar.

A third common cause occurs in people who take acid blocking drugs everyday, for long periods of time. This removes the acid in the stomach, and then that results in the protein you eat cannot be broken down properly for digestion. This protein from meat or other sources, moves along and ferments in your bowel...not a pretty situation... and this forms really smelly gas.
The protein smell is somewhat different from the other types of gas. A good example is comes from pets, older dogs or kittens tend to have this type, which is where the JOKES tend to spring from. I had a cat once who when she was a kitten, could knock you right over! And my family's older border collie, would come and sleep under my bed when I returned home from college for a visit, and she was soooooooo intense, it would wake me UP! WHEW!!!!

The simethicone is good, if your gas is just hurting you. But it doesn't prevent.

You know what I saw in the catalog "Solutions" for this Xmas?
Charcoal underwear pads you wear to absorb passed gas fumes if you are going out to an important dinner etc... and you wear these!
Said they would go with a THONG even! LOL
This is similar:
http://www.flat-d.com/flatdreusable.html
The Solutions one was 5 for $9.99!

With some patience one can usually find the cause of excess gas. If it persists, there are always some digestive enzymes that may help if your pancreas is giving up the ghost. NOW supplements makes some nice formulas.