Don't limit yourself to only subjects for the elderly. You have to make yourself known among the younger parishoners, too.
Our group asks different speakers to give talks about things, using some of the people from our congregation. For example, we have 1 practicing and 1 retired physician in our congregation....they have been helpful with various topics. We have a practicing attorney who helped with wills, advance directives, etc. Get more people involved as you can't do it all yourself.
Our group does free BP checks monthly, we make follow-up phone calls to everyone who has returned home from the hospital, who has lost a loved one, who is going through chemo/radiation, etc. They love to know that someone besides the pastor cares and calls to pray with and for them.
We serve fresh fruit and juice to adult forum 1-2 times per year (healthy foods as opposed to the usual sweet rools, cookies, etc.)
The possibilities are limitless. The whole thing is to make yourselves known to the congregation as a group that is there to help them, cares for them, and is someone who they can contact if they choose. We have also helped revive some members having MI's or CVA's until EMT's could get there.