A 21 year old woman asked my 17 year old brother on a date, should I be wary?

I find it a bit odd. When I was 21 I'd have found 17 year olds far too immature. My first boyfriend when I was 17 was 24 and a lot more interesting than boys my age.

Unless the age of consent in your country is below 18, I wouldn't worry, your brother's a lucky guy

yes. for one, hes not 18. for two, shes drinking age and he isnt. three, if you arent in your "teens" (13-19) you should not really ask a teen out. except for the case of maybe 19 dating 20.

Lucky guy.

He is too young to be dating a grown woman. Its bit even legal in some places because the age of consent varies. If he were my son u would not allow it.

yeah, that's pretty damn suspicious.

naw, some guys like older women

I'll assume your brother must be a good looking guy. Girls go after younger men, usually for sex.
Is he mature enough to say no or resist the temptation for sex ? Hopefully he's not even having sex yet.

want to join em ?

I think it will be okay.

No. Let him get some sexual pleasure and be happy for him.

although it’s only a four year gap,
he’s still a teenager and is a minor.

Is this the same girl who brags she can chop the head of a dic off with the tip of her samurai sword? If so she's ok, she always misses