Here is a sample of what one company uses for it's weight and balance.
Weight Values for Passengers and Cabin Baggage (JAR-OPS1.615 and 1.620)
Adult: male and female, are defined as persons of an age of 12 years and above.
Child: are defined as persons of an age of two years and above but who are less than 12 years of age.
Infant: are defined as persons who are less than 2 years of age.
Non-holiday flights / Holiday flights
Male: 88 kgs. / 83 kgs.
Female: 70 kgs. / 69 kgs.
Child: 35 kgs. / 35 kgs.
All Adults – no children: 84 kgs. / 76 kgs.
Baggage:
Domestic flight means a flight with origin and destination within the borders of one State;
Flights within the European region means flights, other than Domestic flights, whose origin and destination are within Europe.
Intercontinental flight, other than flights within the European region, means a flight with origin and destination in different continents.
Domestic: 11 kgs.
Intercontinental: 15 kgs.
Others: 13 kgs.
Hope the information helps.