You are driving down a lonely road. You see an alien spaceship land. There is a lot of science fiction that deals extensively with reptilian aliens. Very little of it looks at the real differences between warm and cold blooded creatures. Warm blooded creatures generate heat within their bodies to keep there temperatures steady.
Reptiles take on the temperature of their environment.
Putting on cloths makes you feel warmer because they hold the heat you generate in. A sentiernt eptile would never feel warmer after they put on a sweater. On the other hand, putting on a coat before they went outside wopuld make them take longer to assume room temperarture, making them take longer to feel cold and slow down. Discuss the implications. The age question is an interesting one.