: Over time, particularly around perimenopause and menopause, estrogen levels drop. This causes mammary glands to shrink and connective tissue to lose elasticity, often resulting in fat filling the space, making the breasts feel softer and appear wider.
: The areola may become less distinct, and skin can lose firmness due to reduced collagen production.
The relationship between breast size and aspects of health ... - PMC
: Weight gain in later years often translates to increased breast size because of the higher proportion of fatty tissue.