The planet Neptune was in the sign of Cancer from 1901 to 1916. It's important to note that Neptune takes about 164 years to make a complete cycle, spending about thirteen years in each sign, and therefore the interpretation applies to a generation rather than the individual. For a more individual interpretation you need to look at the house position of Neptune in your chart. It is unlikely there are many of these people left alive with Neptune in Cancer and we will not see this combination for a long time to come. The planet Neptune is where we search for our connection with the divine, to an ideal world beyond human imperfection and suffering. It is well placed in Cancer since both the planet and the sign are related to water and the emotions. Neptune being the ancient god of the seas and Cancer the first of the water signs. The emotional caring attributes of the sign of Cancer usually directed at friends and family can be elevated to a higher level of universal compassion and love with Neptune in Cancer. This generation have a care for the betterment of society as a whole. Indeed many were born into a time of an idealistic war to end all wars to finally make the world a better place for all to live in, where great sacrifices were made by a whole generation of people. For this reason of idealism and universal compassion Neptune is considered exalted or highly powerful in the sign of Cancer.