Old age

My shoulder has turned into a barometer! Yesterday and last night it ached and throbbed and limited the work I could do, now that the storm is here it feels better. WTF? First - when did I get so damned old that my joints ache? And secondly - how the freak does my shoulder know a storm is coming? It doesn't make sense! I used to snicker at old people who could predict coming storms with their aching joints yet apparently the phenomenon is real. How does this happen?