Sex Ratio: 

• The ratio between male and female population is called sex ratio. It is usual measured as “the number of females per thousand nales. 
• On an average, a sex ratio of the world was 986 females per 1000 males during 2010 it was reduced 984 in 2011. 
• The highest sex ratio in the world has been recorded in ‘Latria and Estonia’ it was 1174 & 1170 per thousand. 
• The lowest sex ratio was found in UAE which is only 468 females per thousand males. 
• As per the united nations list in 139 countries females are more than the males. Where as 72 countries males are more than females.

Age structure: 

Age structure represents the number of people in different age groups. It includes both male & female population.

• About 65.8% of population belongs to the age group of 15- 65 years who are ‘adults’. 
• Above 65 years of age group is only 8%. They are called ‘aged’. 
• Remaining about 26.2% is below the age group of 15 year called ‘infants’. 
• Dependency ratio – The population ratio between the ages of 15 & 64 (Aults) and below 15,(infants) & above 64 (aged).