OceanB

I'm 72 and my handicap is 9. I presently swing Callaway Epic Forged irons with FC80 regular shafts. I love the clubs and shafts. I now have an opportunity to get a set of the same irons but in much better shape. But they are the FC70 senior shaft. Is there that much difference between the FC80 and FC70? I'm also considering that age will become a factor over the next few years if I'm lucky enough to get there. Any considered thoughts would be appreciated. Thanks. OceanB