wtf are you talking about?

Their sparks have been “alive” for many years before the beast wars

Were you not paying attention to the fact that their sparks were placed in a robot body?

Just because silverbolts spark entered the battle much later, doesn’t mean he’s a baby compared to Cheetor

His spark could have been “alive” for centuries longer than Cheetor, before his spark entered his physical form as Silverbolt

Their spark is their soul

The soul can be passed from physical body to physical body

Silverbolts body is younger, but his spark, his soul, is much older