Being laid-up, I've had some time to think about this and it's tougher than I originally thought. My thought process went something like this,
#13 or #15 at Pine Valley - tons of shot options, but the weather year-round is not that good and at some point I wouldn't be able to carry the lake on #15. #13 is still in the picture.
Road Hole at The Old Course - weather is still somewhat of a concern, but after reading "Final Rounds", I can appreciate the dad's perspective for later in life. This is still an option.
#16 at CPC - Weather is great (except during Crosby week) and the view is breath-taking (so I hear). But the thought of hitting so many balls into the water could drive me to an early grave.
#8 or #18 at Pebble Beach. I'm not sure that I'd ever tire of the approach at #8, but at some point I'd want to revel in seeing the flight of the ball off the tee and that blind tee-shot might lose the appeal. #18 has everything. Weather is great, views are spectacular and it could be played for a life-time without the chance of losing balls everyday.
#13 at ANGC - the weather is playable year-round, albeit the club is closed for six months, but I'd make sure to have a key to the front gate. the prospect of trying to perfectly draw a tee-shot around the corner is encouraging and the options with the second and third shot are varied. Throw in the azaleas blooming and this is definitely an option.
So far it's #17 at TOC or #13 at ANGC or #18 at Pebble.
But then it occurred to me...what about #9 at Royal County Down. The aura at RCD is enough to want to play there for the rest of your life, but is there a more awe-inspiring view that the top of the hill at #9? To not only experience that on a daily basis, as well as watching first-timers faces when they climbed the hill and saw the sweep of the land below them, gorse in full bloom, and the way the mountains meet the city and sea below. Yep, that's the ONE hole I'd be willing to play for the rest of my life. And when my days are done, spread my ashes at the top of the hill so I can contine to take in the scenery.