Do people just run out of tears as they get older?

My own experiential happenings are that EVERYTHING in the body is slowed down and impaired or impeded, from digestion to libido. Dry eyes is common in the elderly. But the good side is, I also sweat less in hot weather, don't get hungry for food often, and don't waste time on trivial things. I don't laugh so easily now, because I'm too scared of falling over and being unable to get up!