The sims must be together for 50 sim years.
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When you have elders and they are retired and never cheated on each other you can have a Anniversary party and if it's good you can have one
Once your two married sims become elders, go to the phone and select the "Throw Party" option. One of the options should be "Anniversary Party".
Once your married couple has gotten to be elders, use the phone to throw a party, and the anniversary option should show up.
When they reach the end of their life span. :(
No. I'm sorry 2 say that I cannot possibly answer this question, as I have just recently started playing halo reach and do not know a lot about it.