I'm 39 years old relatively athletic, 6' 200lbs, swing speed around 100mph with driver and 90-95 with 7i.I'm about 4 months into my golf journey. I'm pretty obsessed, I practice almost daily. Right now I just have a set of crappy used Top Flight XL irons that I got for like 20 bucks to get started.I went to my local shop today to get a 5h. They had 4 used ones I tried out in the simulator. The first 2 I was just shanking every time, or couldn't get the ball off the ground and even on a solid hit the ball would only be like 4-5 yards high and would land after like 70 yards and roll the next 100. The last 2 (Taylormade Sim 2 Max and Stealth) I hit WAY better, way more consistently, etc.Then I asked one of the guys about the shafts on the Taylormades. Fujikira blue 5A, which he said is basically a senior shaft (one of them was cut down 1" shorter as well). Is this normal for a beginner to hit a more flexible shaft so much better? It was seriously the best I've ever hit a golf ball. Is it worth picking something like that up while I get better, or will it stunt my growth and I'd be better off with a regular shaft and just learning to hit it properly?