Thanks for your answers guys. I have got the full nature faction and all of the tech research things are researched in full and completed everything except for the 90yr old award. I have over 400,000 in food and nearly 2 million tech points,115 villagers and about 25 of those are master doctors with more in training or adept.

I read on one of the posts on here that being a healer is less stressfull on the health of villagers so i have a couple who are now in their 50's who have done nothing but healing to see if that works.

I do go through all the villagers health at least once a day and use a potion to top up health but obviously sometimes they die before i get to them as i leave it on normal play while i am at work rather than pause the game.