Hot Shot is like... 70 in robot years. But i play him as if he's some where between 14-20 and Primarily 18 by human standards. I like playing with the idea they almost went with in Armada where Hot Shot was gonna be 14 straight up for "not old enough to drive" jokes.
Smokescreen is one of the last to exit the Well before it shut down. He's equal to 21 but his robot age is played off as ambigious cause Aligned is a mess
Side Burn is equal to 21 and is about 180 (give or take) Not much thought on this one just that he's the youngest Autobot brother and youngest right next to Wedge who was stated as too young to be a soldier.
Optimus is about 8-10 million depending on where I prefer to have the war take place. He's equal to 30-35. He's younger then you expect and forced to grow up faster then he was ready to
Tarantulas is equal to 50, and I'm not at all sure what the heck is up with IDW's time lining so I'm not placing down his canon age. But he might be around Prowl's age.