I don't for a minute believe that schools would be allowed to refuse to accept a child who was not toilet trained. And how exactly would a school establish this fact before accepting a child?
How children are brought up changes from generation to generation, and quite honestly when we discuss this subject we would do well to remember that.
In Denmark, young parents have been told by health visitors, kindergarten teachers and their GPs for at least the last nine years (my grandson is nine now) that toilet training is a waste of time before the age of three, because it has been discovered that a hormone that controls the closing and opening of the bladder's spincter is not produced prior to that age.
I do not know if this is true or not, but I do know that this is the reason that children of three have not been trained. When my generation's children were three, a three-year - old still in nappies would not have been admitted to a kindergarten, but would have been sent back to the creche or day-care until he or she was potty-trained.
My mother was horrified at the very thought of a three-year-old in nappies! She claimed that my sister and I were toilet-trained at 18 months.
So, I tend to believe that the body starts to produce the hormone necessary when a timetable for using the potty is introduced, irrespective of the child's age.
Now, apparently, the pendulum is swinging back.
As to toilet training being difficult or not - for the present generation of parents it is hard because they have been taught you must not say "you must" to small children and would regard it as gross cruelty if told to place a child on the potty with instructions to remain there until they had used it, which was how we, and our children, learned this skill.
Also most parents today hand over babies and toddlers to a day-care, creche or kindergarten and collect them nine hours later when their own working day is over, and honestly, toilet training a fractious, tired child while making the evening meal and getting said child ready for bed - can you imagine it?
It is highly unlikely to be successful.
So before we get carried away on the in my day children did or did not hobby-horse, let's stop and remember how maddening we found it when our mothers, aunts and mothers-in-law started telling us how to bring up our bairns!