Not nearly enough information. Dozens of different American coins have an eagle on the back; the "person" could be anyone from Miss Liberty to a president to Ben Franklin.
Please post a new question with more details - the coin's date, its mint mark if you can find it, its denomination, how worn it is, and a better description of the person.
The value of an old coin with an eagle on the back and a person on the front can vary greatly depending on factors such as the coin's age, condition, rarity, and historical significance. It's best to take the coin to a professional appraiser or coin dealer for an accurate assessment of its worth.
More information is needed. The date and denomination of the coin will help with the answer. Post new question.
The eagle is on the back. Susan B. Anthony is on the front.
On the front of the quarter is George Washington's face. On the back is an eagle (there is no person depicted for the reverse side).
Please see Related Answers:
It's just a common Sacagawea dollar, spend it.
ALL U.S. coins have the back side inverted with respect to the front.
Is it a US coin, be more specific
How much is $5000 Estados Mexicanos dated 1938-1988 with an eagle holding a snake on the back worth in US money
That's called a Standing Liberty quarter. They were minted 1916-1930.
A denomination is needed, post new question.
The woman is Susan B. Anthony, and the coin is still worth one dollar.
Front: George Washington Back: Eagle
That's a Susan B. Anthony dollar coin, and it's worth one dollar.