Work IT So if bat wings are your issue, then your first solution is to WORK THEM in the right way. Unfortunately typing on a keyboard or your phone doesn't count as exercise! You need to focus on your key arm shaping muscles to stop biceps and triceps atrophying and shrinking as you get older. The change in size and shape of your vital arm muscles are a big part of the reason why your arms wobble and lack definition. And not forgetting that on top of all that, you’ve got the decline of your skin’s collagen and elastin as you get older. Skin doesn’t bounce back like it used to without the support of collagen and ‘spring’ of elastin. The slower skin turnover that occurs with age leads to a dull, drab look and uneven surface texture meaning that with arms, it is not about size but about shape and TONE.