I'm 34 and have been semi-RE'd for 2 years now. I wouldn't consider myself FI'd but I do still own 100% of a company that allows us to fund our lifestyle and safe a ton. I say I'm semi-RE'd because even though I have others running the company, I do still meet with the management occasionally to check in and give opinions if needed. Even though I only put in an hour or two a month of work for the company, I still feel the responsibility of it all which is still a weight to bear. There is still random anxiety when communication gets a bit dicey with the management team (IE, someone is pissed about something, etc). Anyways, that is why I don't consider myself fully RE'd.
To the others that are saying that RE is constant excitement even after years, I can tell you that isn't the case for me. Yes, I am astonished at the life that I get to live at such a young age but its not like I wake up every day literally thinking 'holy sh*t, this is amazing'. You get into a routine nonetheless and it becomes the norm. It certainly is life changing and I feel bad for all of those people out there that just don't get it and are OK with working till 65, especially the ones that kick it before they are retired, never getting to taste what we are tasting now (as far as work/life balance).
Another thing I noticed is that with the internet these days, there is a false sense that there are a lot of people out there like us. Real life is the complete opposite. I've never physically met another person in our situation. A large majority of the people, close family included, are so far from understanding our situation the don't even know how to ask questions about it. I'm amazed at the complete lack of curiosity from our immediate family (our bros/sis's/parents).
To all of you out there still working your butts off to reach FIRE, hear me now....IT IS ABSOLUTELY WORTH THE EFFORT. I thank my 23 year old self everyday for putting in the effort that he did at such an early age to afford this life that I have now.