I adopted my pair of rescues when they were five weeks old, and I also have an older cat who is nearly 20! Yep. 2-0. I’ve had her for ages. She’s deaf, but happy as a clam.
I wanted to throw in a couple of tips/ideas (hopefully I’m not repeating anyone):
–definitely buy high quality cat litter, because the cheap stuff smells
–scoop the litter boxes often (daily if possible) to avoid any accidents
–invest in high quality cat food. It’s okay to start the cats on the food they’re familiar with, but you might want to switch them to something higher quality. Whenever you switch foods for cats, gradually mix in the new foods or they’ll get sick.
–if your cat ever acts strange and stops eating for an entire day, take them to the vet immediately. Cats can get hepatic lipidosis in about 3 days’ time and go into liver failure if they’re not eating.
–splurge on an automatic feeder. Your kitties will probably harass you all night long for a snack, but automatic feeders keep that from being an issue.
–speaking of them begging for food, cats only need about a quarter cup of food per day. They’ll act like they need three cups a day, though. 😛
–never let the cat drink milk. It won’t hurt it, but the kitty will have some bathroom issues for a little while.
–make sure both cats (especially the nervous one) have a “safe space” where you don’t bother them. For instance, if the nervous one hides under the bed, don’t bother it when it’s there.
–playing with them when you first bring them home will help them relax and build up their confidence, so be sure to do that
–if they’re misbehaving, spraying them with a water bottle is a good trick. Or if they get in your face or near your plate while you’re eating, blow a little air in their face. They don’t like that, so they’ll back from your food.
Good luck! I can’t wait until I have a house and not an apartment, so I can adopt a few more myself.
ETA: if you put collars on the cats, make sure they’re the “break-away” collars. My indoor cat recently got caught on something and her collar snapped off. I’m glad she had the break-away kind on though.