I just re-read your post. Mine are guys - like yours, a bit older. I wanted to assure you that I don’t hear really personal concerns, just professional ones where I can act as mentor (even if not always successfully…). I suspect this is not unusual with moms and boys (different experiences/points of views from other CCers most welcome) - and, quite frankly, I’m not sure I’d want to hear much about my young adult sons’ personal lives. I know DH does not hear personal concerns either. We do ask for opinions and “thoughts” on general interest topics and respect whatever is expressed - even if we think WE know better.
I have found it very useful both as a relationship developer and as an aid to gain practical knowledge to ask advice on things such as technology, or for visiting certain areas where they have been and I have not been, or opinions/thoughts on my own concerns on an approach to a professional question I am facing, or anything where I legitimately would like help - all much the same as I would relate to friends or acquaintances who might provide me with ideas or a perspective beyond my own. The responses my kids provide are not always anything I would consider, but I treat my kids respectfully and thank them, just as I would a colleague.