I still have my original bob that I started with. Even tho he is a very old level 40, he still wins races and shows no signs of slowing down. He is like the Mark Martin of GT5, lol.
I've got two that i wouldn't mind retiring, but my M.Schumacher, S.Vettel, M.Weber (matching outfits) and K.Tsuchiya will never leave me since they took ages to find...
My Nexus Sixmodel B-Spec drivers came from off world colonies. They don't like to hear the word "retire"
(Currently a 40.39.39 and three 37's all full grey bar career and alot of erroded statistics... they still earn their keep.
Since I deck them out in Horizon-00 helmets it is hard to spot them either. Some times I need 6-7 questions - cross referenced to tell them appart from a baseline human driver...
I've seen things you people wouldn't believe. Overtaken Group B Rally cars on fire off the Serengeti. I watched Mercedes C-class full beams glitter in the dark near the pflantzgarten. All those moments will be lost in time... like tears in rain... Time to die.
I assumed Bobs automatically retire at level 40, didn't even know they can be forced to retire. The stats of mine don't really seem to tail off though, they seem to mood up and down a little randomly. Actually come to mention it, all but one are on a downer at the moment so perhaps there is something in it...
So wait, what happens when the experience bar gets full? Their stats go down? Great. All that work I put into getting H.Halonen to where he is now will have been in vain after awhile... at least he wins most races with no coaching.