“you go you fast forward two years or three years and a really good app that'll be flipped because you've you've retained people the the vast majority of people that use your products every day are old... you're not optimizing for the newbies anymore because there's way fewer than you've got to keep the old timers involved and engaged and happy”

As Your App Ages, Shift Product Focus From Activating Newbies to Engaging Old-Timers

Early-stage apps are dominated by new users, so product decisions should optimise for first-week activation. In a mature app with strong retention, the vast majority of daily actives have been around for years — and shipping features that confuse them to chase new users is a revenue risk. Tracking cohort composition by age tells you which product strategy to run at each phase.