“That dress is adorable! Can you actually go sleeveless? Those days are gone for me,” wrote my friend in reference to a cute dress I’m planning to wear to a GRAMMY event. I replied, “I’m wearing a DKNY sweater. My arms aren’t very good either. Whose are at 51?” This got me wondering: What the hell happened to my arms? What the hell happens to most of our arms after we turn 50? As few as five years ago, I was flaunting a set of tanned biceps that I was fairly proud of. I