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If she was pregnant, she may have lost the embryo very early and reabsorbed it, which is common if the embryo has a major defect, or she may have aborted around the middle of gestation and something ate the foetus.
As for age, is really depends on the mare's conformation. Older mares that have lots of foals tend to have their uterus drop, and the conformation of their vulva changes. This means it's harder to give birth, and urine and poo are likely to pool in the birth canal, making it very likely that she gets an infection in the uterus.
For a stallion, it depends on whether he has arthritis or not.
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