Hi bsal,
As per the civil aviation requirements here in India, standard passenger weights are as follows :
1. 85 kgs for crew (75+10)
2. 75 kgs for both adult male and female.
3. 35 kgs for children between the age of 2-12 yrs.
4. 10 kgs for children below 2 yrs of age.
This ofcourse may be different in Ireland.
But i hope this gives you an idea. Cheers