Sophia mentions that Dorothy got knocked up at age 19. In other episodes, she says Dorothy was 17.
At about 10:58, after Blanche gets the phone call telling her that Steven's had a heart attack, she & the girls go into the kitchen from the living room. Each time the door swings open as they walk into the kitchen, you can see that there's suddenly no furniture in the living room behind them. For some reason the set appears to be empty as all the furniture is gone.
When Sofia tells the story about the artist who can hold his painting with "no hands", she mentions "Sicily, 1912". Presumably, Sofia is about 84-85 by now so that would make her only around 7 years old when she "hooked up" with the artist.