In general, saying your farewells to a senior citizen is no different than any other age group. However, if you mean senior citizens that have passed away or died, then it is respectful to attend the viewing and funeral of the deceased and quietly say your goodbyes to them,
how to do the speech
A sample farewell wish to colleagues would talk about how you wish the best for everyone. You can also talk about how you enjoyed working with everyone.
A farewell letter to a co worker would vary depending on the relationship. You can summarize all the things you like about the person and the things you enjoyed working on with them. Wish them the best in their future endeavors.
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A sample speech for a colleague could be: We are here today to say farewell to our coworker and friend. Though you are moving on now, we shared many successful projects and many fun times. We hate to see you go, but we wish you the very best. You can add special memories to make the speech longer.
For a college farewell party, it is important to have fun and also be respectful of the seniors that are leaving. Some good questions would be about what they plan to do next, including additional schooling or the job hunt.
Seniors will be very excited to be finished with school. The introductory speech should be fun and full of promise for a bright future.
Just call them by name. Don't use 'Sir' or 'Madam'.
Hi..I found one here http://www.englishforums.com/search/Farewell+letters.htm
Farewell titles to seniors should reflect the personality of the person. Titles should always be respectful and of good taste. Pick a title that would not be hurtful because offending the senior could ruin the event. Think about the person when picking a title and reflect their character. For example, if the senior is a person who enjoys jokes then pick a title that has humor.
Pleanty of examples of little phrases for a co-workers farewell card on the page http://www.fond-farewell.com/farewell-card-message.html