"Actually, the original Nikkor 105 f/2.5, was designed in 1959, the same year that I was born. So I guess that makes me ancient too. I'm using the first edition 105, and love it.
Don't feel so bad now - got 6 years on you though! But I agree - that f2.5 is a wonderful lens. I really can't articulate exactly what it is about it. I have the 105 f2.8 AF micro and it's great for some of the product work I do, but the f2.5 for portraiture is just the best.