I wasn't aware she is as old as she is

When she was on Roseanne she must've been in her mid to late-30s, but I was thinking she was 20-something since Ernie was her first husband and she kept talking about having a baby. They obviously cast her to play someone younger than her age, and she looked young too. However, she was on the Richard Pryor Show back in 1977 and I think she was around 21 then.