How can I tell the age of my box turtles?

[russiantortuga]

I got 5 box turtles.

 

[diamondbp]

There is no conclusive way, but if you post some pictures I could give you a general idea

 

[russiantortuga]

Here's the male

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Here's the female EBT

 

[diamondbp]

Male I would guess 10-20 yrs old, the female 20-40 yrs old. She is definitely an older turtle.

 

[russiantortuga]

Here's the other species

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Another

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The last one

 

[diamondbp]

10-20 / 10-20/ 30-40

 

[russiantortuga]

Thanks