Life without Flying
If flying is "just a career", I understand why you want to stop at age 60 or 65. If flying is a passion and a love then you will do it until you are no longer able to do so, regardless of age or equipment or seat position.
Those who "need" the leftseat at any cost will never listen to the voice of reason, see the desire or absorb the wisdom that will make them a better person or a better pilot.
"Good luck" in your "just a career" choice.