In 2008 I was feeling like I could tell I was starting to get old. Little aches and pains, my vision getting bad, my youth fading away. So I quit my job so I could follow my dream (since 1975!) to hike the PCT. I'm glad I did.
Yesterday on a long local dayhike, my 60-year-old boyfriend collapsed on the trail with chest pains. Search and Rescue took him to the hospital. They said he had a cardiac event of some sort. He has been biding his time, waiting for retirement. He doesn't talk much, but I bet he is feeling right now a little afraid he won't be able to hike the PCT himself after retirement. He looks fine today, but we won't be going on our annual Thanksgiving backpack this year.
So, do it now. Hike the trail. Don't put these things off.