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Same mother for a couple of years ? Any tips on how to keep it healthy and going on for so long ?

Yes! Ill have to make a post about it one of these days...
I have a big 2gal jar of kombucha on the counter with the scoby. Every day I drain off a couple jars of it for 2F with fruit, and then refill with tea. It just keeps going and going. Whenever the scoby gets more than 2in thick I pull it out and rip most of it off. I put just a thin part back in there and it starts growing again. :D

Soooo simple. This isn’t going to help me advise some friends who’ve had a negative experience. Thanks.

It is not going to help? Or was that a typo?
No prob, if you have more questions, I would be happy to help!