I found out last year, at age 40, that I was adopted. Both of my adoptive parents are dead. One died in '79, the other in '91. Why the rest of the family felt it needed to continue to keep the secret is beyond me. My older brother (different birth parents) also found out he was adopted. It's been a weird year so far.
I've been told that it was how that generation did things, but, I'm still a bit ticked off. I mean, I've found my birth mom but she doesn't want to have anything to do with me. What if they had told me after my adoptive mom died in '91? I think it would have made a difference in my birth mom's decision. I don't know. I do know I'm ticked though.