Ok, now you have me worried. It’s the physical stuff that starts to show up. Things that were simple were still ok when they were harder but I’m starting to see that they will become impossible. But I don’t see it as depressing. It’s scary but not depressing. Of course I’m not building a house. So I’m carefully learning to avoid what is becoming too challenging and do more of everything else. That will wear out but I have a close eye on robotic augmentation and will see if I can get into some robotic trials when it becomes an issue.
Be careful about concussion when you hit your head. That can cause you to lose concentration and balance. Don’t make it worse. It is better to change your schedule than really screw up.