When you are 2 months away from your next age, do you use the next age or the current age?

When you are 2 months away from your next age, do you use the next age or the current age?

I am about 31 years and 10 month old. I am still using 31, myself.
When you are 2 months away from your next age, do you use the next age or the current age?
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