Hi,
Another adoptee here. When I saw the subject of this post, I had to stop and write. I don't know if it helps or not, but rest assured, they're most likely thinking of you on that day, too. And if they're like me and many others who have posted about b'days, they're shedding a few tears, also.
I met my birthmom just about a week ago after 50 years and will never regret it. We won't have the relationship that we would have had if she'd kept me, but that's ok because I think it'll be a better one. We're meeting as mother/daughter, but even more so as friends and women. The last two are what I dreamt of when I'd think of the word 'mother', but never came close to having.
A couple of hours after meeting her I was talking about all of the wondering about her that I've done, and it hit me that the person I'd been wondering about was sitting across from me and I burst into tears and said, "I've missed you so much." And missing someone you've never met made perfect sense to us.
Wishing you all an easing of the pain.
Warmly, heartbeat