For 3), I felt that not all problems for the elderly have been discovered by others. We can study how the elderly live and closely examine all their actions.For 2), I feel it is good to know how the elderly react to these problems. They may aggravate the troubles,or lighten them partially. We can find out by asking the elderly their reactions.For 1), I originally thought up the question of harmful habits the elderly practise that worsen their health, but changed it after realising it was a yes/no type. I changed it to ask how we can convince to elderly to adopt better habits. We can find out this by showing the elderly the positive, comparably better effects of the habits to adopt.
Some good aspects and questions. But on the idea of healthy lifestyle practices, you might want to continue to focus on what are some of these practices that are different than the ones promoted in the media. What are some of the specific requirements of the elderly, that perhaps would be significantly different than the usual ones shown on TV/newspapers/radio/etc.
For 3), I think that it might be very strange as why should they be facing problems which we do not know as if they are, one of the elderly would have voiced up about the problem.