Adult passports are valid for 10 years from the date of issue, after which they need to be renewed. Child passports are valid for 5 years. Child passports, which are for children under 16 years of age, have a validity period of 5 years.
1 Additional Answer
A passport may last for a few years or longer. If you were 15 and younger when you got a passport then it lasts for about five years. If you were 16 and older then it lasts for about 10 years.