Which one should I use " be" or "become"

[Helped Wanted]

Say for example,

In the year 2019, I will be twenty-five years old. I might <be or become?> an astronaut.


Similarly,

In the year 2023, I will (be or become?) a doctor.


Which one would be best used in the sentence, be or become? Thanks for helping! ^o^

[Tdol]

In the year 2019, I will be twenty-five years old. I might be an astronaut.

This might mean that you already will be one, that you had qualified or graduated or whatever the selectiob process is.

In the year 2019, I will be twenty-five years old. I might become an astronaut.

This would indicate the start of your career.

[Helped Wanted]

Many thanks for helping again, Teacher Tdol! ^o^

[Tdol]

You're very welcome.

[RonBee]

Say for example,

In the year 2019, I will be twenty-five years old. I might <be or become?> an astronaut.


Similarly,

In the year 2023, I will (be or become?) a doctor.


Which one would be best used in the sentence, be or become? Thanks for helping! ^o^

In the first example, "I might be an astronaut by then" would be a good fit. In the second example, I would use be. Also, you could say, "I will have become a doctor by then."

:)

[Helped Wanted]

Thanks for your advice too, Ronbee! ^o^

[RonBee]

You're always welcome.

:D