How long do or can Transformers live (naturally)?
I understand that information may be limited; especially since they are [seemingly] constantly warring among themselves, and Earth's interaction with them has been very recent.
But say in a period of peace, how long could a Transformer live?
Please take into account their ability to heal (if they do), their hardiness (being extremely durable) and their technological advancements and capabilities.
Canon answers only please.