That always bugged me (among other things I never liked about F4)
I'd even go so far as to say "at least" 15 years older. The 60s had a different view when it came to older men marrying younger women. Even the family friendly Dick Van Dyke show had an episode where we learned that Laura was underage when they were married and falsified her birth certificate. There was never a ethical question about the decision.
As for The Marvels, I am still looking forward to seeing it but it was a flop financially. That combined with the Kang news seems like Marvel will be seriously re-working their plans going forward and I bet they're regretting they wasted Secret Invasion on that D+ show at this point.
As to why the Marvels failed to spark interest, I am surprised that no one has mentioned the trend of declining box office returns on Super-hero movies over the past year. It is not like the Marvels is an anomaly here, just the lowest performer. Whether the drop in interest is due to actual audience boredom with the genre or just people refusing to spend their money on a new movie when Shazam. Black Adam, Flash and Blue Beetle were critical disappointments and ranged from lackluster to utter shit, IMO. In contrast, other than Ant Man and Eternals (maybe Thor?), the MCU movies have been received well. Is it possible the average movie going public doesn't distinguish between the MCU and DCEU and has just been stung one too many times? And I am writing this paragraph as an avid DC fan who wishes that all those recent movies had been much better than we got.