The developmental period that is entered at about 35 to 45 years and exited at about 55 to 65 years of age. middle and late childhood. The developmental period extending from about 6 to about 10 or 11 years of age; sometimes called the elementary school years.
HOW TO GET MORE SPIN FROM YOUR WEDGES I recommend you get fit with a set of high-spin box-grooved wedges. Combined with a quality wedge swing and a urethane-covered ball, you'll max out your Backspin Equation and get the shot-stopping power you need.
Spin is dictated by the twist rate of the rifling, no matter the length of the barrel. 1 twist in 9 is the same from a 16  barrell as it is from an 18, 20 or even 24 barrel. One complete rotation of the projectile every nine inches.