And this is eternal life, that they know you the only true God, and Jesus Christ whom you have sent. (John 17:3 ESV)
Eternal life is about more than just the duration of the life you have from God. It's about more than the Heavenly city where you're going to spend eternity. It's about more than just knowing that your sins are forgiven and will never be remembered against you. It's all of these things AND it's about the incredible privilege of knowing "the only true God" through His Son, Jesus Christ.