Age really isn't a factor, but it becomes more difficult to pop adult animals, but if you are skilled, it can be done.
Somehow I doubt anyone is trying to pop an 18 foot retic. At some point probing seems like a better option.
Justin
Originally Posted by spix14
How old is too old to sex your snake by popping? And can this be done on pythons? I would assume so but I'd only ever seen it done to corn snake hatchlings.