This will be my second thru hike. The first was NOBO in 1990, the year I turned 30, and it made a huge difference in my life. I changed careers, and became much happier. I am retiring in April, and will be doing a modified SOBO (Hiking from Harper's Ferry south April - June due to family commitments, then heading for Katahdin). I am retiring at 55 so that I am young enough to do all the hiking I want. 5 years ago I had throat cancer - I cancer free now, but the experience reminded me that we do not have any guarantees in life, and you need to go for it while you can.