Acting your age is considered a good thing. When someone reminds you to act your age, usually it is because you are being a chaotic toddler or a huge baby... Act your age!
But showing your age, confusingly, is not always a good thing. If you have shown your age, often this means that you revealed some blind spot or vulnerability or frailty particular to a certain stage of life... I don't make the rules! I simply mutter Show your age, much? and then go smugly about my business, secure in the absolute correctness of my opinions.
In the context of a basketball game, generally you want to be the side doing the age-acting, and you want your opponents to be the ones doing the age-showing... Act your age, young Pacers! For most of Tuesday night's Game 1 of the Eastern Conference Finals, the Pacers managed it: They were plucky and hyperkinetic...
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