What I believe now is that adoption is a life-long issue, and cannot be relegated to a single event in the past. The Evan B. Donaldson report on promoting healthy identity development in adoption emphasizes the fact that adoption affects identity formation, and identity formation doesn't end with the teen years:
Adoption is an increasingly significant aspect of identity for adopted people as they age, and remains so even when they are adults. A primary contribution of this study is the understanding that adoption is an important factor in most adopted persons’ lives, not just as children and adolescents, but throughout adulthood. Adoption grew in significance to respondents in this study from early childhood through adolescence, continued to increase during young adulthood, and remained important to the vast majority through adulthood. For example, 81 percent of Koreans and over 70 percent of Whites rated their identity as an adopted person as important or very important during young adulthood.This finding was actually contrary to the researchers' initial hypothesis, that the importance of adoption to identity would taper off after adolescence.
So the truth is that adoption was, is and will be an important part of an adoptee's identity. It cannot simply be relegated to a single event in the past.