Olmo's are nice Italian bikes. One like that with campy GS components is not the "top of the line" model, but not the bottom either. It would be nice to know what the tubing was made from, there should be a decal on the bike giving the brand of tubing, at least if it was Columbus tubing. As for age, sometime in the 70's would be indicated. There should be date marks on the campy components, one of the easiest to find is the one on the back of the crank arms. In this case probably a number in a square, such as a "7" in a square, which would indicate 1977. Also, there may be a date on the Nuovo GS rear derailler, on the top of it. Not sure on that. There are even date stamps on the nuts on the campy axles, so you should have plenty of places to look. Nice bike!