yes, Cristiano Ronaldo can sign a contract
They can sign it, but it is not legally enforceable.
In the United States, a 17 year old needs parental consent, and the parent has to sign a contract for the minor.
In most cases, a 16-year-old can sign a contract, but there are limitations and certain contracts may require parental consent.
No, they cannot sign a legal contract. They must be 18 or have a co-signer.
No. At 15 you cannot legally sign a contract.
No, a 17 year old cannot sign an enforceable contract. You must be 18 to do that. However, if the 17 year old confirms the contract after turning 18, (by making a payment or other action) it can be enforced.
In most cases, a 17-year-old can legally sign a contract, but there are exceptions depending on the type of contract and the laws of the specific state or country. It's important to understand the terms of the contract and seek legal advice if needed.
18
A person must be of legal age to sign a contract. A lease on an apartment is a legal contract. So a 16-year old would not be able to sign this document.
An 18 year old person is an adult so in all states they may sign a contract. So the answer to your question is none.
You could sign it but the contract would not be valid as you are a minor.
Anyone who is over 18 years of age and of sound mind is able to sign a contract. An 18 year old can rent an apartment or buy a car which includes signing a contract.