I really dislike that word, "spry." It's only used to describe those of a certain age. Which age I am, I suppose, but who needs reminding, especially when my back reminds me by screaming at me every morning and all day long. It's like the word "frisky." When an older person finds him or herself beset by a certain....itch, they're not described as being "turned on" or whatever, they're just frisky (or naughty). Kittens are frisky. Puppies are frisky. Fillies are frisky. Old people, like young people--shudder to think--are horny.
Of course you can't always control your attitude. If you could, all the psychiatrists and psychologists, as well as much of Big Pharma would be out of business, the divorce rate would tank, the country would be less politically polarized, and everyone would appreciate irony and the Absurd. But to the extent that you can, it oft-times can be helpful, or not, depending on how you define a "positive" one. (I'm often accused of having a "bad" or "negative" attitude. I don't. I'm just cynical, but in the most positive sense imaginable.)
I did enjoy my birthday in the sense that I made it through the day without getting hit by a bus. Thanks.