SMS has grown to be a common form of interaction in Norwegian society. Its adoption started among teens but has since been taken into use by other age groups. However, the use patterns for teens seem to be different from those of older users. This paper examines the assertion that SMS is a life phase and not a cohort phenomenon. That is, its use is more intense among teens and more moderate among older age groups. Data for the analysis comes from a series of six nation-wide surveys of Norwegians over the age of 13. Questions on the reported use of SMS were included in all these surveys. This information was adjusted in order to remove the effects of generally increased use over time. The analysis shows that the proportion of text messages sent by different age groups stays rather stable over time. Indeed there seems to be a type of "standing wave" of use associated with older teens and those in their early 20s. While there are cohort effects visible in the data, the analysis indicates that texting is largely a life phase phenomenon. If the curve had flattened out with time it would have indicated that the teens are carrying texting with them as they grow older. This, it seems is not the case. The overall use of SMS has increased in Norwegian society but the relative distribution of the text messages has remained centered around those in their late teens. This seems to indicate that the intense use of SMS is a life-phase phenomenon.