No you clearly said Ororo was in her early 30s when Storm was introduced (also when she first met Jean).
You: "Storm was more like early 30s..."
And you also clearly said Jean was 23ish when Jean and Storm first met (also when Storm was introduced):
You: "...and Jean was...going into her mid 20s like 23ish. when they first met so no."
If we are to follow that tombstone with Jean's birth year being 1956 and death 1980 and do comic book ages that way (many would argue that would be the wrong way to calculate comic book ages), then yes Jean was 24 when she died. Ororo presumably born late 1950-early 1951 (she was 6 months old in 1951), and was introduced in 1975, and calculating comic book ages the same way, then no Storm was not "early 30s" in Giant Size X-men #1.
So back to Dark Phoenix, Storm is around 5 years older than Jean in the comics. Sophie is 23 today (I misquoted the wrong age: 24) and Alexandra will be 28 later this year. So the five year gap between the two actresses matches with the same 5 year gap between the comic book characters. Tell me again why the latter can't be the big sis figure to the former?
Have a good day sir.