Broadly speaking when you are 60 you must finish work esp if you work for the gov here.

Every country has the right to say who can and cant go in.

Yep Qatar has tightened up on letting people over 60 in because too many coming to visit rellies and then going to hospital.

I think it may depend on the level of health care in the country of origin which determines if there is any leeway.

It may be harsh but its any country's right.