Psychological development of human beings is possibly one of the most interesting and also most complex areas of research. Both the individuality and the dynamics of psychological development require sophisticated research strategies. In this way, the fine line between generalizing and scientific knowledge and the “ethos of difference” can be explored. Given the latest developments in the field of Epigenetics, developmental psychology will likely have to evolve across the lifespan in the future. This means examining the influences of previous generations on the individual. Innovative research approaches and meta-discussions of a scientific-theoretical nature included.