A mixed-methods comparative case study across Spain, Italy, Chile, and Colombia reveals a stark demographic divergence: Chile and Colombia are aging at compound annual growth rates of 4.18–4.21%, with population doubling times of just 17 years, versus 36–50 years for Italy and Spain at 1.39–1.96%. Despite all four nations having established healthy-aging policy frameworks, implementation remains fractured by fragmented services, inadequate community care infrastructure, workforce shortages, and misaligned financing mechanisms.
The finding reframes the dominant narrative in geriatric health policy. The bottleneck is not legislative ambition but execution — a distinction with enormous practical consequence. Latin American health systems face a compressed demographic transition that leaves far less time to build the primary care capacity, frailty screening pipelines, and health-social care integration that European systems have had decades to develop imperfectly. For adults and clinicians, this signals that frailty assessment embedded within routine primary care — not specialist referral — is the realistic near-term lever. The study's reliance on expert interviews and policy document review, rather than patient-level clinical data, limits causal inference about which care models actually reduce frailty progression. Cross-national comparisons also risk confounding by unmeasured socioeconomic variables. As a preprint posted on medRxiv and not yet peer-reviewed, these conclusions should be treated as preliminary. Still, the comparative framing is valuable: this is a confirmatory but urgently timed analysis that gives quantitative weight to a slow-moving crisis now accelerating.