I agree strongly with all of this. And I like that he specified mutual admiration rather than mutual respect. While respect is vital to a good relationship and probably sufficient for a good marriage, I think you need mutual admiration for true romantic love. You need to idealize each other a little bit.

The only thing I'd add to this is passion. Lust doesn't actually really fade in my experience. Maybe you don't fuck every day like you did in the beginning, but desire is pretty consistently present if the relationship is good. And yes, people age, but attraction dynamically adapts as you get older. I wasn't attracted to 40 year olds when I was 18 but I am now. And I'm not attracted to people in their 60s now but I'm sure I will be when I'm around that age.

Anyway that's my tangent. Great list.