Well, I am 26 and I was born in 1987, and while I grew up with TNG, and viewed it as my favorite for many years, at first thinking TOS was stupid and corny, I have now since come to realize that TOS is my favorite trek series. Perhaps it is more accurate to say that TOS is 1-A and TNG is 1-B.
The Blu Rays certainly did help in getting me into the series. Once I took that first step, I was hooked for life. At first I watched only with the cgi effects, but now I will only tolerate the original effects.