Old age and survivors

Add some meaningful introductory text to the policy field here.

Indicator Name	Subcategory I	Subcategory II	Technical name
Year of introduction of old-age program	Old age	Introduction	old_old_intro
Example: Type of old-age program	Old age	Coverage	old_old_cov
Example: Placeholder 1	Survivors	Introduction	old_surv_intro
Example: Placeholder 2	Survivors	Coverage	old_surv_cov