The short answer is no; senior flex and ladies flex are not the same, even though they are very close in their properties and requirements. Ladies' shafts are the most flexible, and Senior shafts are the second most flexible. They are perfect for those who find the regular flex shaft too stiff, and the ladies' shafts too flexible. The more flexible the shafts, the greater potential they have to produce long-range shots. On the other hand, the more flexible the shaft is, the less accurate it will be since they tend to twist more. Evaluating your swing performance is the best way to assess your flex needs. Based on their flex, there are five types of shafts. Extra stiff [XX] Extra stiff [X] Stiff [S] Regular [R] Senior [A] Ladies [L]