The period from ages 18 to 25 is sometimes called ‘emerging adulthood’ (Arnett , ) since it has come to be characterized by major life transitions. Linguistically, this means that lifespan change in the individual (Sankoff , ) might be particularly likely during these years (Labov : 447; Bigham : 533; Kohn : 20). Addressing a need for more real‐time sociolinguistic research on early adulthood, we employ data from a panel study of a single speaker, ‘Clara’ (b. 1986), interviewed every 12 to 18 months between the ages of 16 and 30 (Tagliamonte , : 274–276). We examine four linguistic variables that differ according to level of the grammar and social salience in Clara's community (Toronto, Canada). For each variable, Clara's rates of the variants shift to match those of subsequent age cohorts in the community around her as she gets older and joins the workforce. These findings attest to emerging adulthood as a sociolinguistically formative period. More generally, they emphasize the inseparability of individuals and their linguistic surroundings.