All breasts are the same

A young man asks his father, "Dad, how many kinds of breasts are there?"

The father, surprised, answers:

"Well, son, there are three kinds of breasts. In her twenties, a womans breasts are like melons, round and firm. In her thirties to forties, they are like pears, still nice but hanging a bit.
After fifty, they are like onions."

"Onions?"

"Yes, see them and they make you cry."