while 18 is old for a snake, Ball Pythons are some of the longest lives snakes around..47 years is the record i believe, but 20-25 is not all that unusual. I would not reccoment getting into hots without alot of experience with other snakes. Also without an experienced keeper to teach you the ropes and proper ways to handle and deal with hots.
As for a retic, they are amazing snakes, I have had a few and dealt wth some monsters. (largest snake ever to bite me was a 14 foot retic). While it may seem like a good idea at first to get a retic, it is usually not because of there space requirements.
as for another snake, it depends alot on what you are looking for, iif you are looking for a smaller snake simular to a ball python, i would reccomend maybe a dumerels boa, or maybe a hogg island boa. Carpet pythons can be a good choice as well.
If you have any questions about any snakes you like or are interested in keeping, let me know and ill do my best to help you out
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