A wound ball which is approximately 10 years old, stored at room temperatures and low humidity, will have lost about 0.5 to 1.0 % of its IV (Initial Velocity) which will affect its distance by a couple of yards.
Do used golf balls lose distance? Its results confirmed that in the absence of visible damage, repeated use had no effect on a ball's performance. However, it also found that even small scuffs led to a measurable loss in distance, reducing driver distance as much as 6 yards. Read More...
In my experience, the average length of time to get an axel for a skater under 14 with reasonably good jumping ability is between 6 months and two years, but as other posters have said, the amount of ice time and the level of coaching is also a factor. It's also not unusual to get a double sal or toe before the axel.
How long does it take to land double axel? Read More...
The Biles II – Triple-double (floor)
The Biles II is the most difficult women's gymnastics skill ever completed on floor. This movement adds an additional twist to the Silivas which was the most difficult gymnastics move for a quarter of a century.
What is the hardest part of gymnastics? Many call the beam the most difficult event in women's gymnastics, one that requires all the skills a top gymnast needs: grace, power, control, rhythm, flexibility and — most important — mental focus. Read More...