Can I use the word "they" when writing in first person.?

Can I use the word "they" when writing in first person.

For example:
I was so excited as they leaped into the air.
Update: Are you allowed to use "they" when writing in first person? I searched it up and it showed that pronouns for 1st person is I,us,we,etc. But the word "they" is a pronoun for third person point of view
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