The whole idea here is that one is allowed to get older, but not to age. We can really, really slow aging through exercise, stretching, and diet. When something starts to hurt, it's not because you've become older, it's that in becoming older you've lost some of the innate resilience you have when younger. You have to replace that with conscious choices.
My motto is that age doesn't make you change your fit, weakness does. Don't change fit, get fit. But it's your choice.
Your reach is correct when, hands on hoods, forearms horizontal, your upper arms form a right angle with your straight torso. That angle mostly remains the same throughout the range of elbow bend, but is most easily seen when all the way down.
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Results matter