A word or phrase that modifies a word not included in the sentence is a dangling modifier.
Here is an example:
<em /><em>Hungry, the leftover pizza was devoured.
</em><em />You can see that the word <em>hungry </em>refers to <em>us, </em>but <em>us </em>is not included in the sentence. The way it is written, it would seem that <em>hungry </em>refers to <em>pizza, </em>which is wrong.
A speech topic that would be appropriate for a group of retirees would be, to me, to explain that once retired from one's main employer life and one's aspirations and drive do not end there. For example, it is still possible to earn money but less strenuously and rigid than punching a clock by, for example doing freelance work on the internet. Also, now that there is more time, one can pursue his/her real interests of say, writing a book, becoming an artist or supporting progressive politics, for example.
