Are Transformers robots?

• The Transformers are "self-configuring sentient modular extraterrestrial robotic lifeforms", originating from the planet Cybertron.

  

• They are powered by 'Energon', a source of energy ubiquitous on the Transformers' home planet and in their culture, that is not only used as a power source for themselves - consumed like food, or - and their machines, but also as currency. On a more fundamental level, it's "the basic building block of Transformers' bodies and sparks"; 'sparks' being the souls of Transformers (more on Energon here).

• They don't change significantly..
  ..unless you count (apparent) size (more on that on SciFi SE).

  
  

  "Clearly, the pitiful humans at Hasbro are so overwhelmed by the awesomeness of Cybertronian life forms that they can't get the scale right."

  ^{- Starscream breaking the fourth wall in Transformers Comic Issue 23}

  ---

  The 'life cycle' of Transformers does nonetheless have a sequence of stages that can be interpreted as 'growing up':
  "Transformer life begins with the purposeful construction of a body by an existing individual or group". At this stage, the 'protoform' (introduced in the Transformers spin-off Beast Wars), "an unfinished, "embryonic" Transformer body", is the first identifiable stage, which can be seen as birth, since "these simple "skeletal forms" [..] are kept covered in nutrient gel within stasis pods that nurture and protect their apparently fragile forms".

  Alternatively, the Transformers have been created directly as "complete, fully mechanically built and functional, though lifeless, robotic bodies".

  
  ^{From spark to protoform.}

  Then

  at a certain point, these newly constructed forms are either "switched on", infused with life from an outside source, or scan an alternate form, and solidify into a finished, mechanical robotic form. Life begins.

  They are "preprogrammed with a complete personality and most of the basic knowledge necessary to survive and socialize in the world". I gather they have self-learning abilities, and at this point there enters a stage with relatively no changing or ageing, except in their programming. They can live for "millions of years without any noticeable alteration or ageing", and are theoretically immortal. Some individuals seem to have an altering appearance, and are

  shown to look different and "younger" at earlier times in their lives. These changes seem to be signs of advancing age. While they could also be a simple factor of their gaining new or upgraded bodies, the clear intention is that their later forms are more lined, worn and less spry, suggesting ageing.

  
  ^{Jetfire in Transformers: Revenge of the Fallen. A robot. With a cane.}

• As for reproduction: apart from the aforementioned assembly, there are two other possibilities of a new Transformer life form coming into being, namely through 'budding' and 'sexual' reproduction:
  • 'Budding', where a mass of growth on a Transformer's body spontaneously bursts free after being induced by a form of energy, and quickly evolves from 'protoform' to a completely developed individual.
  • Besides that, there are rare hints of 'sexual' reproduction, or, rather, Transformers of both genders 'spawning' offspring, but the process is unclear.

^{Additional sources:
https://en.wikipedia.org/wiki/Transformers
https://tfwiki.net/wiki/Transformer
Comic page at top: The Transformers (Marvel US) #2, "Power Play!"}