Doesn't seem unreasonable. Look at your router. I have 17 and I would say we're a totally normal household - the kids don't even have phones yet.
We have 2 phones, a tablet for the kids, a couple of Google homes, a Chromecast, 2 yoto players, a printer, a smart TV, 2 laptops, a raspberry pi, a solar power Inverter, an Oculus Quest, and a couple of things that have random hostnames.
We have 2 phones, a tablet for the kids, a couple of Google homes, a Chromecast, 2 yoto players, a printer, a smart TV, 2 laptops, a raspberry pi, a solar power Inverter, an Oculus Quest, and a couple of things that have random hostnames.
It adds up.