So when do we start? By first grade at the latest, though there is no harm in starting sooner. If a child can count and is asking questions about where money comes from and what things cost, then it’s time to begin. Kids who have gotten wise to the power of pestering parents to buy things are ready as well. Even if children seem oblivious to money, there is subtle power in having them watch their small piles of allowance money grow bigger over time.