In Illinois, what is the age requirement for tenants to independently sign a residential lease?

In Illinois, the legal age to enter into a contract, including signing a residential lease, is 18 years old. This is based on the principles of contract law, which stipulate that individuals must reach the age of majority to have the legal capacity to enter into binding agreements. This means that tenants who are 18 years old or older can independently sign a lease without the need for a co-signer or parental consent. This age requirement helps to protect both the rights of the tenant and the landlord, ensuring that all parties involved in the lease agreement have the legal authority to fulfill their obligations and rights under the contract.