Age-chart of Members in Nogizaka46 and Keyakizaka46

Keyakizaka46 members are generally younger than Nogizaka46 members, but there is a lot of overlap between the two groups -- as well as between generations of each group.

Sugai Yuuka (K46) is a month older than Ikoma Rina (N46). Nagahama Neru (K46) is only a month younger than Saitou Asuka (N46).

I found a chart on a Japanese site that made all this visually clear and have created a romanized version of it, for the information of anyone interested. Click here or on the image below to go to the chart.