The correct answer to this open question is the following.
I choose the 6th Stage, Intimacy vs. Isolation. In this stage, Erik Erikson. People from 18 to 40 years old can experiment this stage when trying to connect ad establish formal relationships with other people.
My example of how one might experience the stage at another age is that people that can be placed in stage number seven, Generative vs. Stagnation, can also have problems connecting to other individuals trying to find their perfect match.
People from 40 to 65 years old fall in the 7th stage of the Generative vs. Stagnation. However, during that period of time, they can have issues and conflicts in their personal relationships.