The size of a country's population and the associated age distribution can be causa; factors for enonmic

Question:

The size of a country's population and the associated age can be causa; factors for enonmic growth. Why is the size of the population important to economic development? Can size be a disadvantage? Why is age so important?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...