Geez, my cats are all porkers compared to most of these kitties!
Some of this is guesstimating.

Sammy 8 yrs 15lbs
Leroy 5yrs 16lbs
Peanut Butter 4yrs 18.5lbs
Stubby 4yrs 6lbs
Lucky 4yrs 12lbs
Maggie Sue 3yrs 14lbs
Pete 2.5yrs 14lbs
Pepper Jack 2.5yrs 15lbs
Pervy 2.5yrs 10lbs
Magoo 8yrs 12lbs
Rosco 6mths 6lbs
Abigail 6mths 4lbs