A concept that's useful here is called "Bereavement Overload." Extreme grief behavior among some older people may come from having to deal with a succession of bereavements, sometimes in overlapping timeframes, which may interfere with the completion of the mourning process.
The successive demise of friends and loved ones at older ages are often accompanied by various personal, physical, mental, social, and economic losses as well. Hence, some find they are unable to absorb more losses than they can accommodate.
Copyright 2000