Age distribution for each of the three Hercules substreams identified in this work and for all of them considered together (right panel). The substream Her b presents a maximum at around 4 Gyr with an extended long tail up to very old ages. Her a is similar, but with a less clear peak. Substream Her c appears as a more uniform distribution between 2 and 10 Gyr. We also plot as red lines analytical normal fits for Her a and c and a log-normal fit for Her c and the entire distribution. The corresponding mean μ and deviation σ, the geometric mean μ_G, and the multiplicative deviation σ_G are depicted in each panel.