I probably will not return to my very deep diving exploits in the near future... I've pretty much filmed what I wanted to in the 180-200 fsw depth range so I have no specific reason to return to those depths at this time.
I do hope to return to more frequent diving in the 100-150 fsw range as there is plenty I still want to film there (it's where I see the greatest number of nudes... er, nudis). Now that I'm back to paying for my own air fills, and the economy stinks out here, it may be a while. However, I'm quite confident that I would regain my resistence to narcosis once I do resume such diving.
As for age... I've done most of my "extreme" diving (depth and frequency) in my 50's and 60's. Back in my teens, 20's and 30's I either dove shallow water environments or had to stay shallow because I was diving with high school students in my marine biology classes.