I would say that any thing in my list (don't have one, but could come up with one) and your list too, comes down to money. If you've got enough money, then just about any and all of that can be done.
This may be a narrow view, but if you consider 2 columns, money and responsibilities, the two kind of work against each other. When you are younger with fewer responsibilities, you can probably make things happen with less money. As you get older and your responsibilities increase (like your list of hold ups) then the need for additional money to do things also increases.
Maybe that's a narrow view. Maybe creative thinking allows you to still do things with responsibilities with less money, but I think it is probably much more difficult.
I don't know that I've got any big dreams. I could probably come up with a list of wants 10 miles long, so maybe those are the "fantasy" part of things.
Travel extensively - check
Take lots of photos - check
etc... (the list is only limited by imagination, and I've got a pretty good imagination.
And in the hopes that I beat the inevitable (despite your G rated stipulation)
Come on, you knew someone would eventually post it.