Background: The transition to retirement can be a challenging event, necessitating the adjustment of new routines, roles and expectations. Such modifications have the potential to impact the individual's quality of life and psychosocial well-being. t is of the utmost importance to develop intervention programmes that prepare people for retirement, with the objective of facilitating a positive and healthy transition.

Methods: A parallel randomised controlled clinical trial with two arms will be conducted. The study will be conducted at the Faculty of Psychology of the University of Salamanca (USAL) in Spain. The study will recruit individuals aged 60 years or older who are already retired or who will retire within the next five years. The participants will be divided into two groups: the intervention group (IG), which will undergo a comprehensive psychoeducational intervention programme, and the control group (CG), which will engage in a controlled follow-up. The programme will comprise 12 sessions over a period of three months. All participants will be assessed at the outset and conclusion of the study, as well as after three months, during which time data regarding their socio-demographic characteristics and responses to the following scales will be collected: The World Health Organization Quality of Life Measure - Brief Version (WHOQOL-BREF), the Retirement Attitudes Scale (EAJ), the Satisfaction With Life Scale (SWLS), the Questionnaire of Stereotypes towards Old Age (CENVE), the Acceptance and Action Questionnaire-II (AAQ-II), the MOS Questionnaire of Perceived Social Support (MOS), the General Health Questionnaire (GHQ), the Generalised Self-Efficacy Scale (EAG) and the Self-Regulation Scale (EAR).

Discussion: The objective of this study is to enhance the comprehension and implementation of intervention programmes in anticipation of retirement and the subsequent phase of life. To this end, a comprehensive psychoeducational intervention is proposed, with the aim of improving quality of life and attitudes towards retirement, increasing life satisfaction, psychological flexibility, perceived social support and general health, self-efficacy and self-regulation, and reducing stereotypes about ageing. The programme is designed to equip individuals with the skills and knowledge to navigate the challenges and opportunities associated with the transition to retirement.

Inclusion Criteria:

• Be retired or nearing retirement (within 5 years)
• Be 60 years of age or older
• Voluntarily sign the consent form to participate
• Complete the initial assessment

Exclusion Criteria:

• No evidence of literacy difficulties or a significant deficit in language comprehension
• Not meet any of the inclusion criteria.

They will be made available to researchers in the document repository "GREDOS" of the University of Salamanca, Spain.

Data will be available at the end of the study.

Open access for researchers.

The work of sequencing, randomisation, recruitment and allocation of the trial sample will be carried out by research staff who are not involved in the assessments or interventions of each group, thus avoiding any potential bias in the trial.

Participants will also be blinded and will not know which group they have been allocated to and therefore which intervention they will receive. In order to minimise any contamination between groups, the assessment process will be carried out by external research staff who will perform the measurements and who have been previously trained and educated to avoid subjective bias in the process, as they will be unaware of the intervention group to which they have been assigned, thus masking the blinded assessment by third parties in the clinical trial. In addition, the researchers responsible for the statistical analysis of the trial will be blinded in order to increase the rigour of the trial process and thus the scientific quality.