My take on this, whole Optimus Prime thing as someone who grew up with the original series and really likes and enjoys the new series is, this isn't the same Prime.
The G1 Optimus Prime was created back in the 80's when back then heroes and villians were still in the field of US cartoons very "Black and White" and had usually been fighting the enemy in question for awhile before we(the audience) first meet them, while today heroes are portrayed with having flaws and learning as they go and usually having their first encounters with the series main villian during the first episode.
Also both G1 Optimus Prime and Beast Wars' Optimus Primal were older than Transformers:Animated's Optimus Prime. G1's Prime had been fighting the Decpticons for years by the time we had been introduced to him and had become a wise, experienced and respected leader. Primal may not have had the battle experience, but had already been in a leadership position for along time and had the trust and respect of most of his crew, and earned through his actions the respect and trust of others. Transformers:Animated's Prime is a young Prime, he's not all that different than the way that G1's Prime wa presented in the first Transformers:War Within mini-series that Dreamwave released a couple of years ago and that IDW recently re-released in a complet collection of all the War Within mini-series.
I think age has alot to do with it, I don't think that any of the Autobots/Maixmals or Decpticons/Predacons ever had given ages, but in terms of human years I think both G1 Optimus and Primal were probably in their late 30's to mid 40's, while Transformers:Animated Prime seems to be in his very late 20's to mid 30's.
The G1 Optimus Prime was created back in the 80's when back then heroes and villians were still in the field of US cartoons very "Black and White" and had usually been fighting the enemy in question for awhile before we(the audience) first meet them, while today heroes are portrayed with having flaws and learning as they go and usually having their first encounters with the series main villian during the first episode.
Also both G1 Optimus Prime and Beast Wars' Optimus Primal were older than Transformers:Animated's Optimus Prime. G1's Prime had been fighting the Decpticons for years by the time we had been introduced to him and had become a wise, experienced and respected leader. Primal may not have had the battle experience, but had already been in a leadership position for along time and had the trust and respect of most of his crew, and earned through his actions the respect and trust of others. Transformers:Animated's Prime is a young Prime, he's not all that different than the way that G1's Prime wa presented in the first Transformers:War Within mini-series that Dreamwave released a couple of years ago and that IDW recently re-released in a complet collection of all the War Within mini-series.
I think age has alot to do with it, I don't think that any of the Autobots/Maixmals or Decpticons/Predacons ever had given ages, but in terms of human years I think both G1 Optimus and Primal were probably in their late 30's to mid 40's, while Transformers:Animated Prime seems to be in his very late 20's to mid 30's.