Yes. First of all, it's important to retain empathy and remain professional throughout everything. Unless you're concerned about his personal safety, it's not

Yes. First of all, it's important to retain empathy and remain professional throughout everything. Unless you're concerned about his personal safety, it's not appropriate to try to diagnose his cognitive decline or push your superiors toward decisions. Focus on adjusting your own personal work behaviors to accomodate him while still getting your work done, as frustrating as that might sound. Consider adjusting your interaction style with him to include more frequent updates. Perhaps a daily summary of what you did that day that leads with bullet points about what you're still waiting on (budget approvals, decision making). Send him a short e-mail summary about conclusions from your conversations with him. These habits are actually good to have anywhere, but they're especially helpful in this case. Second, don't assume that you're the only one seeing this. Your manager's manager is almost certainly aware of what's going on. If your boss' boss starts interacting with you more, stay professional and stick to the facts about work rather than making it personal about your boss' problems. Your superiors will put the facts together and come up with a process in due time. Finally, recognize that your work situation could change in the coming months or years and prepare yourself for where you want to go. If your boss retires, do you want to move up into his position? If so, now is a good time to ask to take on more responsibilities and offer to help him out where possible. If not, consider where you'd like to go next. Would you like to be on the same time with a different manager? Then maybe stick around. Are you on the fence about leaving already, and this is the last straw? If so, maybe don't delay and start finding a new job. If this becomes too much of a problem for your own career or job satisfaction, it's better to switch teams or jobs than to try to handle this situation directly. It's a difficult situation for everyone involved, but the last thing you want to do is end up on the wrong side of a difficult personal/medical situation.