You're right about them being 5 years old. That's their mental age.
The colleagues are one part of the jigsaw as to whether a job is worth continuing or not.
A big question is "What else?" What else could you be doing to earn a living? If it's something better go and do that. Never ever stay in a job because you feel obliged to be loyal to them. Or you're worried about what future prospective employers would think if you skipped jobs every 2 months.
Are you learning stuff that's useful to help you earn more money?
What's your supervisor like?
What about what you actually do for your work? Do you enjoy doing it? Or do you feel like a wage-slave battery hen?
As long as you stay in this job, treat it as a personal experiment in frame control. One where you try to maintain your frame that you're going to enjoy your work and your working day. With good amounts of positivity, enthusiasm, professionalism.
Don't get sucked into their negative frame.
I think you're right to not engage in gossip. It's a waste of time, mental energy and it's unprofessional and it's bad person-management.
Have you reported their behaviour to your supervisor yet? If not, please go ahead and have a confidential word with her. It's important that you talk to her about them before they talk to her about you. Be as open and honest as you like. It's fine to tell her that you're thinking of jacking the job in because of tweedle-dumb and tweedle-dumber.