Nobody expects that they will have the same energy levels at the age of 72 that they had when they were 22. Everyone expects to become tired more quickly in older years, but there are limits to how far this can explain every case where an older person senses their energy level has fallen. They might tire faster from strenuous physical activities, but they should not tire so fast while performing light tasks. If this happens, it could be a symptom of IPF.

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