In my opinion ricki, and I’m 35 y/o and a former dj, I would suggest JAM or TM Century. They both have a superior history in the world of jingles. And grew up as companies through the times you are speaking about. They can match jingles to anything the folks in that age range like to hear, from easy listening to CHR and Hot A/C. But really, and some of the more wiser folks in this forum can correct me if I’m wrong, it really depends on what format you are putting out there for the listeners. And what you want to project as a radio station. There are many companies to choose from also.
If you and they would like to hear samples of these companies’ work:
http://www.jingles.com for JAM or http://www.hitdisc.com for TM Century.
Hope this helps you.
Rich