The practice by which adults engage with new forms of knowledge, skills, attitudes and values is established with the term “Adult Education” [6] and the learners can be called lifelong learners. Adult education assumes that the learners choose the content and the manner by which they learn, based on their needs, and they are responsible for their learning. Therefore, the context they choose to learn in can be formal, non formal or informal [7]. The education institutions with credentials, like schools and universities, represent the formal context, while the ones without credentials (e.g. museums) belong to the non-formal context of learning. Informal education, on the other hand, is an ongoing learning from everyday activities related to the environment of the adult (family, community, work, leisure, etc.) [8]. Adult education or Lifelong learning combines all of the three learning contexts [9].