Shiv and Sim discuss their friendships and how they have changed from their teenage years through adulthood until now. They also bring up an interesting social science study (https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.160097) examining the use of cellphones among different age groups and what it may tell us about the numbers and quality of friendships and relationships as we get older. What do you think? Have your friendships changed over time? Let us know at [email protected]. We'd love to hear from you!