Increased farting with age can be due to lactase deficiency, medications, anal sphincter weakness, or weight gain, as outlined here. https://www.aarp.org/disrupt-aging
I think one's colon becomes stiffer with age due to loss of elasticity, and becomes less compliant and able to hold on to the gas - so it has to escape.
Here's an electron microscopy study showing the decrease in tissue elasticity with age, due to decreased cross linking of elastin and other changes : https://www.karger.com/Article/FullText/331278
Here's proof that older people have less elastin in their spinal discs.
Age-related changes of elastin content in human intervertebral discs.
https://pubmed.ncbi.nlm.nih.gov/8026603/
Old rats have weaker collagen than young ones:
Age-related alterations in the strength and collagen content of left colon in rats.
"hydroxyproline content and hydroxyproline concentration in old rats were increased by 36% and 26%, respectively, compared with young rats"
https://link.springer.com/article/10.1007/BF00341292
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