I understand what you mean.
I took my first dose of T on October 24, 2006. It's sometimes hard to remember that it's been that long because it, well, HAS been that long. I've long-since completed the "firsts" and have been living as who I am for over a decade. It's sometimes hard to remember that I spent 30 years living as female.
I remember when I started transition, I found a transman group on LiveJournal. (Yeah, it's been that long...) I remember talking to the guys who had been on T for 3, 4, 5 years and being so in awe of them. Now I've been on T 3 times that long...