my girl is going on 2 year soon as long as you keep high humidity and don't mess with them to mush there not bad to keep. Fair warning if you want a snake that moves around viper boas are far from that only time i see her move is when she smells food and thats not often due to there low metabolism. she will get nice and deep in the substrate and sit there for days.
And as far as breeding i think ill be picking up a male next year and give it a shot