Not at all ... in fact, I've found them to live a long and fruitful life, in fact, most of them have a full life meter most of the time ... they KNOW how to balance the work and relaxation situation of life

As the villagers get older, and it gets harder and harder to continually go fishing, or be always at the research table, and they get slower, sometimes the "stress" brings down their health meter. I found that if I just focus them with checking off the healing bar, even if I don't train them to inspect the flowers, etc., that they will start relaxing, and their health meters will go up in more than 80% of the time without any further intervention. My oldest villager was 97, and I believe it was a doctor who made it there.