Why are babies always cold to boomers?

Basically the title.

I have 3 infants (they are 10 months old) and if my mom comes over and they are in anything but long sleeves, long pants, and socks then I need to put more clothes on them because “they have to be cold!” Despite them showing zero signs of being cold. This is true for any of my boomer family members, I just see my mom the most. Heaven forbid one pees out of their outfit and I don’t have an extra one nearby and they have to be in just a diaper in my 68 degree house for 2 minutes, not that she would actually go get an outfit while I change the diaper to shorten that time, she will just comment on it. Why? If the babies are happy then why can’t that be enough?