Convert dependent consent to adult consent

[mhebrard]

When a participant who was consented as a dependent (by a
parent/guardian) reaches the age of legal consent, the consent
should transition to an adult consent — re-affirmed by the now-adult
participant rather than implicitly inherited.

Design questions before implementation

• Trigger: age-based automatic, study-team initiated, or participant
  initiated?
• What happens between "trigger fired" and "adult consent affirmed"
  — is data access paused, continues under old consent, or other?
• Communication flow with the now-adult participant (and the prior
  guardian)
• Edge cases: participant unreachable, declines to re-consent,
  declines but doesn't actively withdraw
• Audit: how is the lineage from dependent → adult consent recorded?

Context

Raised during a CTRL demo on 22 June 2026 with a prospective external
collaborator (paediatric oncofertility research group).