Alternatively, it’s possible these age trends have nothing to do with generational changes in grit. Instead, what the data may be showing is how people mature over time. My own experience, and the stories of grit paragons like Jeff Gettleman and Bob Mankoff suggest that, indeed, grit grows as we figure out our life philosophy, learn to dust ourselves off after rejection and disappointment, and learn to tell the difference between low-level goals that should be abandoned quickly and higher-level goals that demand more tenacity. The maturation story is that we develop the capacity for long-term passion and perseverance as we get older.