Mouth odour can indicate a dental problem such as rotting teeth or a build-up of plaque. A trip to the dentist should solve that as will regular brushing, flossing and tongue scraping.
Chew your food
If dental problems have been ruled out look to your stomach as inadequate digestion could be to blame.
Consider digestive enzymes
Not chewing food properly or insufficient digestive enzymes can impact on the efficiency of your digestive system, especially as you get older, so consider digestive supplements such as betaine hydrochloride, papain or bromelain.
Supplement for liver support
If your liver has taken a beating over the years through too much alcohol then it may not be functioning as well as it might do, in which case supplements of milk thistle, artichoke and dandelion will improve its function.
Adjust your food & meals
It could be that your smelly breath is simply down to the food you eat, for example you may love lots of garlic but people won't love you for eating it.
Try natural breath fresheners
Try cutting down or chewing parsley or anise seeds - natural breath fresheners.