Figure 5

Fraction of calls from the callers to previous or to next generation callees as a function of caller’s age for the same and different gender pairs. The caller–callee pairs with a generation gap are chosen such that the magnitude of the difference between the ages of the caller and the callee is greater than 20 years. The normalization is such that the fraction of calls to caller’s own generation and fraction of calls to the other generations sums up to one