Unless there’s some pretty significant data pointing to one gender being financially independent before another, I don’t think there’s any reason to think there’s a difference. At least, if you ascribe to “financial independence = end of adolescence”.
College is part of a range of transitional years, not a single point marker - some students become adults in college, some will shortly after graduation, and others may never really grow up. Financial, social, and emotional independence are prerequisites but maturity is also a factor - this is probably the biggest variance - some college students can be at the level of a mature adult as early as freshman year. If you have both the maturity and independence, it’s possible to be an adult in college no matter your age - that isn’t most students though by any stretch of the imagination.