This article explores intraspeaker malleability in the realisation of the first-person possessive in the North-East of England ([maɪ], versus [mi] and [ma]). The analysis relies on a combination of a trend sample and a novel dynamic panel corpus that covers the entire adult lifespan. While [mi] has been around at least since the 1970s on Tyneside, [ma] appears to have made its way into the system during the 1980s and 1990s. The panel data add intraspeaker information to this ongoing change, revealing a turnover in the proportional usage of possessive variants between two recordings that are on average ten years apart. Regression modelling provides differentiated information about intraspeaker changes across the lifespan, suggesting that, with only a few exceptions, intraspeaker grammars are stable across the lifespan. The analysis supports recent panel research that has argued for the importance of considering the socio-demographic trajectory of the individual: while speakers who are part of the ‘marché scolaire’ (Bourdieu & Boltanski 1975: 7) orient towards the standard, speakers working as professional carers (e.g. nurses) tend to retain high rates of the reduced variants across their lifespans to do local identity work and establish better interpersonal relations with their clients.