Answer:
1. Para cuando tenga 30 años, me habré graduado de la universidad.
2. Para cuando tenga 30 años, me habré casado con mi novia.
3. Para cuando tenga 30 años, ya habré viajado a Europa.
4. Para cuando tenga 30 años, los médicos habrán encontrado la cura para el cáncer.
5. Para cuando tenga 30 años, la gente habrá manejado autos voladores.
Explanation:
The Future Perfect Tense in spanish is formed with the simple future of the verb to have as auxiliary and the participle of the main verb.
The transaltion:
1. By the time I´m 30 years old, I will have graduated from college.
2. By the time I´m 30 years old, I will have married my girlfriend.
3. By the time I´m 30 years old, I will have travelled to Europe.
4. By the time I´m 30 years old, doctors will have found the cure for cancer.
5. By the time I´m 30 years old, people will have driven flying cars.