The purposes of this study were (a) to examine two groups of healthy older Dutch English bilingual migrants in a New Zealand setting to investigate whether they were showing signs of L2 attrition with accompanying L1 reversion post-retirement, and (b) to identify possible factors which might play a role in the incidence of any L2 attrition and concomitant L1 reversion. Previous research has focused on similar groups of migrants in the Australian context, while New Zealand based research has focused on language shift and maintenance amongst three generations of migrants. The research design involved an analysis of sociolinguistic life, using questionnaires. These included self-assessments of L1 and L2 proficiency at three key times: on arrival in New Zealand, at time of ultimate attainment and post-retirement. Further, an analysis of assessments of respondents’ L1 and L2 proficiency pre-and post-retirement completed by interviewees’ adult children moderated respondents’ self-reports. The findings revealed a considerable overlap between participants’ self-reports and assessments by their adult children. The study also revealed a relationship between participants’ level of prior education and their ultimate attainment in the L2, with those who had come to New Zealand having learned English at Secondary School English very likely to have achieved a “good” or “very good” level of L2 proficiency. Conversely, those who had not learned the L2 at secondary school prior to arriving in New Zealand, were less likely to have achieved a “very good” level of ultimate attainment as evident both from self-reports and assessments by adult children. The design also included a linguistic analysis of elicited free speech. Data focused on key indicators of age, gender, social class, prior education, occupation and predominant linguistic environment pre- and post-retirement. Free speech was examined for code-switching, response latency and L1 structure in respondents’ spoken L2. Results indicated that a majority of respondents showed ...