The correct guiding principle in this scenario is Human-Centered Design. This principle is explicitly emphasized in ISO/IEC 42001:2023, particularly in the context of aligning AI systems with human needs, values, and well-being.

Human-Centered Design ensures that the AI system is designed with a focus on users, particularly vulnerable populations like the elderly. The AI should be intuitive, inclusive, and usable while enhancing human capabilities.

In ISO/IEC 42001:2023:

Clause 4.2 (Understanding the needs and expectations of interested parties) requires that systems consider stakeholders, particularly end users, when defining system requirements.

Clause 6.1.2 (AI risk identification and assessment) and Clause 8.2.3 (Operational planning and control) reinforce designing systems that respect and respond to human diversity and usability needs.

The PECB Lead Auditor Guide – Domain 1 lists Human-Centered Design as one of the foundational AI principles essential for promoting trust, accessibility, and adoption among users — especially those with specific assistance needs.