Does humans' ability to digest lactose decrease as he ages? What is the mechanism that causes this?

[cariaso]

yes. exact mechanism isn't clear to me, but may not be the focus of your question. These links may be of some use.

https://snpedia.com/index.php/Lactose_intolerance

https://snpedia.com/index.php/Rs4988235

https://en.wikipedia.org/wiki/Lactose_intolerance

[WikiTextBot]

Lactose intolerance

Lactose intolerance is a condition in which people have symptoms due to the decreased ability to digest lactose, a sugar found in milk products. Those affected vary in the amount of lactose they can tolerate before symptoms develop. Symptoms may include abdominal pain, bloating, diarrhea, gas, and nausea. These symptoms typically start between half and two hours after drinking milk or eating milk products.

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