There's no easy answer to this. 18 as the "green light" year is incredibly arbitrary. There's no reason that 17, 19, 21, wouldn't be socially accepted if they had been established 50 years ago.
As a 28 year old, I won't date anyone younger than 23-24. The gap in life experience is so great that it's hard to justify the age difference -- which is the same as a 12 yo (or younger) vs an 18 yo.
It just comes down to the difference in maturity. a 42 yo vs a 48 yo is imperceptible (probably). A 12yo vs an 18yo is repulsive. A 22yo vs a 28 yo is generally socially acceptable but also leaning a bit into the "weird" category.
If you're trying to establish an emotional relationship with a 19yo as a 28yo ... yeah, I do think that is weird and concerning.
As a 28 year old, I won't date anyone younger than 23-24. The gap in life experience is so great that it's hard to justify the age difference -- which is the same as a 12 yo (or younger) vs an 18 yo.
It just comes down to the difference in maturity. a 42 yo vs a 48 yo is imperceptible (probably). A 12yo vs an 18yo is repulsive. A 22yo vs a 28 yo is generally socially acceptable but also leaning a bit into the "weird" category.
If you're trying to establish an emotional relationship with a 19yo as a 28yo ... yeah, I do think that is weird and concerning.