Do I need to open a hospital health certificate to invite the elderly over 60 to fly after buying a plane ticket? How troublesome it is

It depends on which plane ticket you bought. For example, the four major airlines do not need it. For example, those low-cost airlines basically require senior passengers to have a health certificate from a tertiary hospital. You must experience it, or you can't fly. Of course, he should have a note when you buy a ticket. You should read it carefully before you buy it.