I have a villager showing a weakened status, and the health guage is in the red. I’ve tried making her eat (which she does) and drink, but it does not seem to help. She is 49 and I have her doing nothing but research. What can I do to get her strong again?

In the early part of the game, when your villagers don't know very much about medicine, villagers can die in what we would consider their 'prime' years. If she doesn't have 'sick' showing in her status, your doctor can't help her. Research is a good activity for her, since it's not likely to cause injury (a possibility with some activities). I've seen even a villager in the 'red zone' improve, though, when I have a good amount of food in the bin and it's increasing. Cross your fingers!

I had a kid (8 or something) get attacked by a monkey and go down to 1 little slit of red and he's fine now. But I think when they begin dying of old age it says elderly in their status. It did for me. Their health slowly went down. Then I researched the next medicine and it changed from elderly to healthy and his health is rising again.

Old age and sickness aren't the only reasons that villagers lose health and/or die. They can be injured by a special event (such as the monkey attack) or even by working in the village. I've also seen them lose health for no reason that I could figure out.

Building is definatley hard on them. I have a 30 year old male that's been building since he was old enough and he only had about half of his health bar left. Needless to say, he's now on a little sabbatical to the research table. If this doesn't work, then I guess I'll just send him up to te cactus and hope for the best.
-spaceman

i had 5 villagers that had a little slit because of a starvation and they are fine know so hold on to her

Improving or keeping their health up is an interesting challenge at times. I've tried a variety of things, and I'm not positive what's actually working and what's my imagination ;-). But I'll share a few things while also trying not to give too much away to spoil anything for anyone.

In the initial part of the game, trying to keep the food number as high as possible seems to help, combined with continuing to improve the healing and research. I also change their activities from time to time. Once you've reached Level 3 with Harvesting, it's much easier to keep the food numbers up, but it still needs watching so the numbers don't diminish too far -- I try to keep them over 1,000 at that point, but for Level 1 and 2 I aim for at least 300 at all times. Having no food does seem to impact villagers' health if the food isn't replenished quickly.

I've been able to improve health by being diligent about ALL these things, even going from having the red bar to being green all the way across. I also check on my villagers' health often and make adjustments in activities. If someone's green health bar slips a little I do some extra tweaking. It seems like balance is a real key to keeping them healthy -- food, healing, research, etc.

I'm still very much a beginner at this game, so the above is just my 2 cents at this point. I hope that helps a bit.