lenth of shaft for taller players

Sure???

One crude measure is to measure from wrist to floor. While your overall height is over 5’10”, your arm length is longer as well. Not all 6+ foot golfers need added length.

With length change there is also lie and swing weight changes that need to be addressed. As an outlier you need to be fit. As I am a senior player, there is not a stock option for me, either. Even a a senior player.

Check the png fitment chart. It's very in depth and will give you a good starting point. But a lot matters on your swing and how you address the ball at impact.

At 6'5", this question is near and dear to my heart. Shortest answer is to get fit. Lie angle is just as important in my opinion as the length, which is why I recommend getting fit. The other brand fit chart is pretty good, but still is not as good a substitute as a quality fitting.

For the record, I'm 4 degrees upright and 1" over standard on my T200s that I was fit for.