Assuming they were in thier early 20s when they got married they would be between 60 and 65 now. This means thier prime music would be late 50s to early 70s.
Now take in to consideration they will probably have thier children there who are probably in thier 30s and it's very possible grandchildren in thier teens.
The majority of guests will be between 35 and 65.
Here is the research you want to do.
Look for the top 10 songs each year from '55 to '72 especially focus on 62 to 72. These pages will help you
http://oldies.about.com/od/oldieshistory/a/toptenoldies.htm
http://www.mr-music.com/TOP200-14.htm
http://en.wikipedia.org/wiki/List_of_number-one_hits_(United_States)
Break out the disco records you'll need them. Stuff like Abba, Grease, BeeGees, Village People, will break the generation gap and save your ass at some point during the night. I have a buddy that used to be in the business his motto was when all else fails play Abba
Here's a list I used recently for a 65th Birthday. I wouldn't play all the cuts on it most nights it was unique to that crowd but it might show you the diversity you will need
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Good Luck
