Color-period diagram and CMD for all wide binaries containing WDs. Panel a: Color-period diagram of the MS components of the wide binaries color coded according to their age groups. Panel b: Same sample of binaries shown in the CMD but connected to their WD companions (open symbols). The background gray scale distribution is of the 2.6 M stars of the EB21 sample. The MS stars with younger gyro ages (red-orange) show a slight preference to connect to the upper part of the WD sequence, while those with older gyro ages (green-blue) have a slight preference for the lower part of the WD sequence. Younger systems (age groups 1 – 3) and older systems (age groups 4 – 7) are shown with squares and circles, respectively.