After a group of triplet mums I am friends with, had an on-line session of sharing all our triplet baby bumps and reminiscing about pregnancies and gestation when our children were born, I got very, very interested in whether a mother's age could affect the length of a triplet pregnancy. So with the kind information from a whopping 86 triplet mums, the hubster and I produced these graphs.
What seems to have been gathered is that, for some unknown reason, you are less likely to have an extremely premature birth if you older. It would be interesting to find out whether this is because a) perhaps the older women have had children previously and therefore their bodies have experience carrying children in the past and can carry children for longer. Or b) younger woman give more nutrients to the children quicker so the children grow bigger and faster and are therefore born earlier. On the assumption that the main reason for triplets not being born at full term is because they grow too big.
(of course it could just be down to quality of life or other health factors)