Health Literacy and Digital Health in Cancer Patients.

This is a multicentric, prospective, observational, transversal study, aiming to evaluate the health literacy of cancer patients using the approved French version of the Functional, Communicative and Critical Health Literacy (FCCHL) scale in 2 populations: * Population A: patients age 65 and over treated in an oncology or oncogeriatric outpatient clinic, or seen in an oncology or oncogeriatric consultation. * Population B: young patients age 18 to 64 treated in an oncology or outpatient clinic, or seen in an oncology consultation. The following questionnaires: * Approved French version of the FCCHL scale * Questionnaire on the use of digital tools adapted from the questionnaire on digital tools, will be completed once only. It will be completed by the participant during the oncology or oncogeriatric consultation or outpatient clinic appointment, in self-questionnaire mode or face to face, assisted if necessary by a family member or member of the medical team.