Yes in some places (under certain conditions), no in others. Assume it's illegal (even if you're with someone over 21 who could otherwise legally have alcohol in their possession) unless you have definitive knowledge that you are fully in compliance with the laws in your location.
Eighteen years old
No! how is it wrong to like a eighteen year-old??
You have to be eighteen
Typically, a 14 year old cannot work in a restaurant. Since most restaurants serve alcohol, all staff must be at least eighteen.
no.
1990
In Scotland, you must be at least 18 years old to purchase alcohol from licensed premises.
With a work permit - sixteen. If they serve alcohol - eighteen.
Up to parents
Yes
Yes, both are adults.
with your parents consent yes