The body requires more FSH to promote the maturation of eggs and ovulation if FSH levels are unusually high. This could mean that the eggs in the ovaries are of subpar quality and quantity. This is a typical aspect of ageing and affects women more frequently after the age of 38. However, elevated FSH levels can occur in even young women. For instance, if a woman in her 20s has primary ovarian insufficiency, her FSH levels may be high (premature ovarian failure).