Why are these instruments "soft law," and what does that mean for enforcement?

The national: the Senior-Citizens-Act-2063 (the 60-years'-floor (the Nepali-statute's-own-line (the benefits'-age-key))); The verification-note: the 60-threshold (the Act's-structure (the age-cited- by-the-secondary-sources' consensus (the allowance's-eligibility-tied))); The international (thefunctional): the UN's-approach (the no-fixed-treaty-age (the 60/65-statistical-convention (the developing-world's-60-use (the functional-definitions ("older persons" — the UN's-language (the Madrid-Plan's-own-term)))))); The definitional-significance: the age-the-entitlement's-trigger (the allowance (the discount (the home (the maintenance-claim — the defined-then-the- protected))).