in other people's eyes?
I've been thinking about that lately, what with the babies and all.
External markers of adulthood:
Owning a home
Financially independent (Serious job with retirement plan and/or pension)
Children and/or pets
Relationships with other responsible adults
Internal markers of adulthood:
Established morals, values, and the conviction of one's beliefs
Acceptance of one's self
Can you think of any others?