I'm too late but was gonna guess around 3.5 only cause there's very few older than that, that isn't killed.
They taught us that back in college and I believe I've said it on here a few times but there is no way of knowing a deers age unless you send out a tooth. Some base age on teeth but some deer eat in very sandy conditions so their teeth are worn must faster or they base on belly hanging but some deer just live in a smorgasbord therefore get fat faster
Very cool you sent that out!
Where did you send it?
What do they charge?
How long did it take?