At the ripe young age of 74, soon to be 75 in September and always thinking of going to graphite shafts, because of my age? Well I still play steel shafts. I know some on here get tired of hearing that I always go to see my Titleist fitter in this area when getting new clubs, but there is a reason. Not only to get the right clubs but the correct shafts. The new steel shafts are so light and flexible that you might want to consider them. I get good distances with my AMT RED R 300s with my T300 irons. I played XP 105 S300 shafts in my 2018 AP1s before changing to the T300 clubs. Really like the feel of the regular shafts, thanks to my fitter. Distance and pattern is what I expected.

For each 9 gram difference (decrease) in shaft weight you will need to add 2 grams to the heads- a 5 gram reduction in grip weight will offset a 9 gram difference in shaft weight. To keep it simple an 18 gram lighter graphite shaft giving a 2 point swing weight decrease could be offset by adding 4 grams to the heads or a 2 gram addition to the heads and a 5 gram lighter grip weight.

The 9 gram to 1 swing weight difference can vary with the shaft weight distribution within individual shafts, but, this swing weight difference is a good starting point. I hope this helps.

Strickly from a cost perspective you may be better off trading in your current clubs and purchase new clubs with the graphite shafts with the swing weights calibrated correctly. Each shaft can run about $100 give or take - not to mention labor and new grips. T300's in graphite run $137.50 per club and you get new clubs out of it.

Lots of good advice here- a good fitter can get you where you want to be- steel of graphite are options at any age- shafts I would look at would be the the Nippon Zelos 6, 7 or 8: 69 - 85 gram shafts.