It is perfectly fine for a 22 year old to date an 18 year old. The 18 year old is consenting and is of legal age so, there isnt anything wrong.

Can a 22 year old date a 19 year old?

Is a 19 year old dating a 22 year old weird? The social acceptance rule is half your age plus 7. You are 22, so half of that plus 7 is 18. Therefore, you dating a 19 year old is socially acceptable.

Can a 18 year old date a 24 years old?

It is not illegal for a 24 year old to date an 18 year old.