what happens if mensuration doesn't come in a proper time or age ?
Menstruation is a process which depends on various factors like hormones, so, it occurs at different times in different individuals. Usually it occurs around the age of 12-14, but it may get a little late (at the age of 15-16 years) in some girls. If it does not occur till 16 years of age then there might be some medical issue and the person should consult the doctor to identify the cause and treatment.