This book traces the motivational dynamics embedded within lifelong foreign language learning trajectories, examining the factors which generate and sustain motivation throughout a learner's life. Embracing a complexity approach, it views motivation as a long-term individual process that evolves along a narrative continuum, developing over the course of life, personal experiences, choices and events. This narrative inquiry delves into the captivating and unique experiences of three exceptionally motivated older adult learners who have embarked on a lifelong foreign language journey and maintained their momentum after 60. It will be relevant to researchers interested in third age language acquisition, L2 motivation and the impact of additional language learning on wellbeing. It also offers pedagogical guidance to optimise language education quality through better appreciation and anticipation of the autonomous third age learning experience.