I am sure to catch backlash for this next statement but a lot of times it seems that people with kids stop caring. Which is only natural, understandable, because biologically something has arrived that takes all precedence.
But to me as an outside observer and co-worker I see a person stagnating.
I've had to teach senior architects not to send private ssh keys to each other and instead use public keys. How to do basic naming schemes for servers. And those are just two "timeless" examples. I won't even mention all the modern tech they ignore because they haven't cared about their profession for the last 15 years.
Edit: For context I am mid 30s and these people are late 40s or early 50s. I am not stupid enough to think I can avoid this in the future.