It is only recently known that we can’t properly make conditional amino acids, as we age, and we stop churning out as many enzymes and stomach acid, too. There may be some benefit to assuring any complete protein can be properly broken down, which might include the use of digestive enzymes with meals. Also, supplementing with amino acids could be helpful.
Enzymes typically break down proteins to amino acids. Ingesting amino acids gives you those same outcomes, but at a higher cost, financially and with time. If interested, look for Branch-Chained Amino Acids in a supplement powder, typically found in a whey-based one.
These would be my general approach.
Older people with stomach problems (and maybe even without) probably need HCL supplements to enable the stomach to gain the value of nutrients. (Stomach acid drops as we age)