Yeah, I definitely noticed a big drop off on my reaction times in my mid-30s which makes it a lot harder to trust yourself not to get hurt... and the injuries take so much longer to heal.
It's such a different world now... we weren't allowed inside until dinner time. I have no idea how many hours I spent just doing stupid things in our backyard... but I guess the other side of that is I probably wasn't learning at the same incredible rate as kids with an iPad now.
I think there is some hope for the generation of kids from today's kids, they had parents that saw one extreme, and they had the other extreme, I wonder if it will balance out soon. Fun and learning.