I don't have any older furbabies. All of my babies are 1.5 years and younger. Somehow we ended up with 4 in a semi-short period of time.
I also worry about the future and them aging at the same time. It's really made me incredibly responsible. I have learned to save for their futures (as odd as that sounds) and the medical expenses they are sure to have at some point down the road.
I base my entire life around them and their schedule. I stay at home now, but in the future I'm sure I'll be getting a job and the pups will surely be attending daycare for their entertainment and so that they can be active and have a wonderful day while I'm not here.
I have to say it surprises me when people have many dogs just because I know how hard it is, just with my 4! No offense to anyone who has many dogs-- I just don't know how you do it

.
I feel there's constantly things to be done-- grooming, feeding, play time, potty time, ect ect. And on top of that there's always a medical expense because if one has a small scratch or I feel they aren't feeling right they go straight to the vet because if I had children that's what I would do, so why act differently for my dogs?
I'm not even sure if I answered your question! *lol* But it definitely is exhausting with multiples which makes me certain that I won't have another dog until all of mine have passed on one day. It also makes me overly certain I won't be able to open my home to another one no matter the situation. It makes me feel bad at times, but I know my limits and what I can realistically provide.
I participate in transports for rescues and volunteer my time because while I'd love to foster I know I can't. This makes me feel like I'm helping the pups of this world out, but still am being responsible to my first priorities-- my babies at home

.