Do younger speakers of Aberystwyth English (Wales) pre-aspirate more than older ones? Previous research reports that they do, but finds a high degree of individual variation. We build on this work by enlarging the database with the inclusion of younger speakers. We confirm that pre-aspiration increases in frequency and duration in apparent time. We further investigate whether duration analyses are affected when zero duration values are excluded, that is, whether pre-aspiration is indeed longer in younger speakers, or whether it applies more frequently. We find that pre-aspiration applies obligatorily for the majority of speakers, so that excluding zero values does not affect the statistical results. Finally, we examine the interaction of pre-aspiration with pre-glottalisation, and show that pre-glottalisation tends to block the application of pre-aspiration, with individual-specific patterns. The interaction between the two is nevertheless not accounted for by age.