I enter competitions to win things that I or family members would really like. I have sold prizes before, if it was an instant win and I was trying for another prize, or I recently won a bangle that didn't fit. But mostly it's just things that my family would like.
I would much rather leave competitions for someone to win that would really love the prize if it wasn't something I was interested in. It just seems fair.
I wasn't aware their were competitions specifically for seniors, but the people that run the competition should monitor and pick out the people that aren't eligible. If you're not eligible for a competition I don't think you should enter it, keep it fair.
Interesting topic