Final answer:
Bone density does not cease to increase at 21 in males; it continues to increase until about 30 years of age when it peaks.
Step-by-step explanation:
The statement that bone density ceases to increase around 21 years of age in males is false. In reality, bone density continues to build until about 30 years of age. At this point, bone mass peaks and then starts to decline as part of the natural aging process.
Women do lose bone mass at a quicker rate than men, especially after menopause due to reduced levels of estrogen, which is crucial for bone formation. To prevent osteoporosis, a diet rich in calcium and vitamin D, along with weight-bearing exercise, should start in childhood to maximize bone mass before the decline begins.