Can a 18 year old buy bitcoin?

Could you elaborate on the legal and practical implications of an 18-year-old individual purchasing Bitcoin? Is there any age restriction or specific legal requirements that need to be met? Additionally, what are the potential risks and considerations that a young investor should be aware of before making such a transaction? Understanding the nuances of cryptocurrency transactions, especially for minors or those just entering adulthood, is crucial in ensuring informed and responsible investment decisions.