I would agree Christie is older then 30-31. I would put her at upper 30s probably 38. She just doesn't seem 30-31. She "seems older" perhaps it's the hair. It's gorgeous hair but it's pretty old fashioned looking. Yes, you nailed it with "younger style". I can't imagine Kelly being just 41 either. I would put her more at 46-48. Sometimes they say that you can tell a woman's age by her hairstyle. Some women, who are stuck in their lives, have their hair in the same style they did when they reached adulthood. Kelly seems to hide her face under too long hair and bangs.
I believe Lisa 2 for 50's.
I think Allison and Jill both saw 40 already. Allison is such a martyr and that's such a heavy dragon to slay and carry around so perhaps she just may be in her 30's but her lifestyle has made her look older. I mean if you are blaming everything but yourself for your problems you can never solve them.
I saw that photo from Melinda with Kim and her 80's hair. Whew, I could smell the fumes of the Stiff Stuff hairspray from here, so I would put Kim at her age that she said.
Jodi looks 40. Her photos of her and her parents looked pretty late 60's to me.
Lisa 1, I have no clue. I can't relate to her. she was too weird for me to even estimate. Her parents looked like they were pushing 70 years old. So, yes, she probably was a late baby and is 40, since that was part of her goal anyway, to grow up at age 40.