  A critical component of user studies is gaining access to a representative
sample of the population researches intend to investigate. Nevertheless, the
vast majority of human-computer interaction (HCI)studies, including augmented
reality (AR) studies, rely on convenience sampling. The outcomes of these
studies are often based on results obtained from university students aged
between 19 and 26 years. In order to investigate how the results from one of
our studies are affected by convenience sampling, we replicated the
AR-supported language learning study called VocabulARy with 24 teenagers, aged
between 14 and 19 years. The results verified most of the outcomes from the
original study. In addition, it also revealed that teenagers found learning
significantly less mentally demanding compared to young adults, and completed
the study in a significantly shorter time. All this at no cost to learning
outcomes.
