First of all, people need oxygen for survival, and tissues also need oxygen.
Secondly, the elderly have lung disease, so they need more oxygen than normal people.
Moreover, lung diseases reduce the filterability of oxygen, so inhaling more oxygen has a certain effect on people's health and the recovery of lung diseases.
In short, there is no harm in inhaling oxygen, but don't waste it, hehe.
I am a heron, from Hengshui.