I'm Very Confused By The This Is Us Timeline

Photo: Ron Batzdorff/NBC.
Apparently, Jack and Rebecca Pearson are really good at aging.
We've always had a vague sense of the This Is Us timeline, but a page from the script for the show's finale has us second-guessing what we knew about the Pearson parents. .
The finale script page, published by EW, reveals that a 28-year-old Jack first met Rebecca in 1972, at the insistence of the meddling but well-meaning Mrs. Peabody. We know from the show's pilot that the kids were born in 1980, making Jack (and presumably Rebecca?) 36 at the time. That makes sense; the show opened with the kids' 36th birthday, and this means it would have showed Jack's 36th birthday opposite that. If Rebecca were also 36, it's realistic that she had complications with her pregnancy, too, which sadly led to the loss of the couple's third triplet.
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But if they were both 36 when their children were born, that would also mean Jack and Rebecca are in their early 50s when their kids are teenagers. And they definitely don't look that old in the flashbacks.
This Is Us has gone to such efforts to age Mandy Moore as present-day Rebecca, so why is there virtually no age difference between Jack and Rebecca in 1980 versus when their kids are growing up? Rebecca still looks like she's in her mid-30s when the kids are teenagers. It's confusing, to say the least. It would also mean she was a lot older than we thought when her band went on tour.
Of course, there's also the possibility that Rebecca is younger than Jack, and that they weren't both celebrating their 36th birthdays in 1980. Or, she could be an "exceptional ager," as Cosmopolitan puts it. Rebecca does have a pretty positive attitude, which, according to the study Cosmo referenced, can majorly impact how much your skin shows signs of aging. Either way, Jack isn't always a positive character, and he should at least have some gray strands in that beard.
This Is Us isn't the first show that's failed to depict characters' aging realistically. In its season three finale, How to Get Away With Murder left fans wondering why Charles Mahoney hasn't aged in a decade, if we're supposed to believe he's Wes' father. I get that it would be difficult to have so many different versions of Jack and Rebecca at various life stages — but This Is Us pays so much attention to detail that not showing the Pearsons' aging just feels off.
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