I was curious as to whether anyone has used this on an ollld animal? If you did, what happened when your animal retired? Did it age as a normal animal would (16, 17, 18 example)?

I don't think I have, but I want to say it should revert back to original age 

I've only every retirement bred 

but you could do a massive point damage if you had everything lined up perfect

double points month 100 privates some tickets for fun. 
 Then go back retirement breed breed boost 

The age thing would bother me, if I was to do it. Though I'm thinking perhaps an Admin would be able to turn the age back to its original once it retires for the second time. 

Thanks for replying! ^_^

Bumping so that a fellow mod can help answer this and provide more clarity!