Sixty year old restarted,the shoulder I think is playing up when I practice chords.Ive got one of those freebie sheets that come with new strings and I challenge myself to go through them ,apart from all the f bar chords.i find when I start I'm all contorted and trying to push my fingers through the neck of the guitar .once I have them sorted I seem to be able to relax,c7and g have been a pain but are improving.B is improving ,but a as for F.maybe laterAs they say,practice,practice ,practice!