No that is not normal at all. Try building hospitals. The hospital itself tends to expand life expectancy . Your going to want around 70 years of life to be a solid life expectancy age to shoot for. Hospital index of 120 is like bare minimum level if your broke or out of hospital professionals. Shoot for 150 depending on your population level. If you can afford to get to 200 without having your monthly profit sink into negative numbers then go for that. If your lower population you can end up getting a ton of people growing each month. You might also want to give your population clean water, found in the transportation index, and maybe roads to drive on and train tracks so the economy doesnt depend entirely on trucks. Then you might want a good education system so you can trian nurses and doctors to build that higher hospital system and run your corporations.