I've done many of these projects before, and will raise issues. "Let's just see how it goes!" and "well... we might make some mistakes, but that's how we learn!" And I'll say "but I thought we were supposed to be learning from each other?" "yes!". "Why does no one ever want to learn from me?" I've done XYZ longer than these colleagues have been adults, but I'm never asked for stuff, people avoid my input, etc.
What's more interesting is that a couple of folks on the client side of the equation (contracting house) have been added who are older, and ... they're quite open to picking my brain. We mesh quite well, and have pairing sessions and learn from each other (but I'm giving more than taking in those cases). With the younger crew... there's just a real standoffishness, and focus on 'team' and 'learning from each other and our mistakes' but... they're willing to make mistakes (repeatedly) vs taking my input to avoid those mistakes in the first place. The client's new person seems to have picked up on this and is raising some issues.
For a while, I really thought it was something wrong with me, but as I jump around between clients/contracts/etc, it seems to be more age related. The larger the age gap, the less impetus there is to work 'together'. And... I'm trying to think back to when I was 25... how open would I have been to 50 year old colleague's input? If they were 'management', I'd have to. Otherwise... possibly not? Hard to remember that far back, other than that I thought I was invincible :)