The Portuguese community in Toronto is the largest in North America; however, its immigrant population is now aging. This paper addresses senior immigrants who had a transnational “later life” and discusses this practice in the transatlantic context, using a lifecycle model of transnational migration. Later life is a life stage that is highly feasible for transnational migration, as seniors are mostly disentangled from various obligations, such as work, child rearing, and caregiving for parents. Transnational senior migrants in Europe and North America can be categorized into four groups: Intra‐Europe Rich, Intra‐Europe Immigrant, North American Snowbird, and Trans‐Atlantic Immigrant. Trans‐Atlantic Immigrant seniors, the target group of this paper, differ from the other groups on several points, including seasonal preference for transnational migration, motivations, and legal regulations. The paper considers the questions of why senior Portuguese immigrants choose to stay in Portugal for an extended period each year, while mainly living in Canada, and how their later life is structured between the two countries. Transnational later life is a strategic practice of senior Portuguese immigrants in Canada in the last stage of their lifecycle, allowing them to maximize government pension payments while simultaneously enjoying the highest quality of life possible in both countries. Immigration from Portugal to Canada accelerated in the 1960s and 1970s, and this immigrant population is now aging. The senior Trans‐Atlantic Immigrant is significantly different from other transnational senior groups in Europe and North America, in terms of seasonal preference for transnational migration, motivations, and legal regulations. Transnational later life is a strategic practice of senior Portuguese immigrants in Canada in the last stage of their lifecycle. Immigration from Portugal to Canada accelerated in the 1960s and 1970s, and this immigrant population is now aging. The senior Trans‐Atlantic Immigrant is significantly different from other transnational senior groups in Europe and North America, in terms of seasonal preference for transnational migration, motivations, and legal regulations. Transnational later life is a strategic practice of senior Portuguese immigrants in Canada in the last stage of their lifecycle. La communauté portugaise de Toronto est la plus importante d'Amérique du Nord. Cependant, cette population immigrante est aujourd'hui vieillissante. Cet article traite des immigrants âgés qui ont eu une « vie transnationale tardive » et étudie cette pratique dans le contexte transatlantique, en utilisant un modèle de cycle de vie de la migration transnationale. L'âge avancé est une étape de la vie qui se prête bien à la migration transnationale, car les personnes âgées sont généralement libérées de diverses obligations, telles que le travail, l'éducation des enfants et la prise en charge des parents. Les migrants âgés transnationaux en Europe et en Amérique du Nord peuvent être classés en différentes catégories. Les personnes âgées immigrées transatlantiques, le groupe cible de notre recherche, diffèrent des autres groupes à plusieurs égards, notamment en termes de saisonnalité des mouvements, de motivations inhérentes et de spécificité des réglementations. Ce texte analyse les raisons pour lesquelles les immigrants portugais âgés choisissent de rester au Portugal pendant une période prolongée chaque année, tout en vivant principalement au Canada, et comment leur vie est structurée entre les deux pays. Au final, la vie transnationale tardive s'avère une pratique stratégique qui permet de maximiser les paiements des pensions gouvernementales tout en bénéficiant simultanément de la meilleure qualité de vie possible dans les deux pays.