The answers are given as follows.
Step-by-step explanation:
1. The chronological age is defined as the age with reference to date of birth of a person but the functional age is the one at which their mind is able to function.
2. Number of expats in the country and generational growth in numbers in previous generation's time.
3. Seniority usually comes with a status in many societies of the world. As a person ages they are seen to have more experience and as such more respect.
4. Age stratification is differentiation of ages into different groups like middle age and adolescence to define phases of life.
5. Ageism is discrimination against aging people. Ageing people are not preferred or simply refused jobs, they are also less likely to get shelter in case of need, and do not get insurance cover easily.