@linz
It is estimated up to 60% of adults 60 and over will develop some form of Hiatal Hernia. Larger hernias may require surgery, but typical hiatal hernias can heal with exercises and stretches that can strengthen the diaphragm. These exercises can reduce the risk and may even relieve some symptoms.
Yoga is a big one I found through research that can help. Just be careful as some poses are not productive and can possibly increase symptoms.
Also exercise and losing weight can help a lot if you are outside of your normal BMI.
Here is positive research regarding all of the above –
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734640/