I just wanted to exercise sculpting an old woman and I’ve seen the wonderful alphas used by Rick baker in the Afrikan woman tutorial.
Do you know where did he find those wonderful alphas ? 
(the bumpy skin and the leathery skin one) ?
Thanks in advance for suggestion and if you would like to share swome other alphas for old skin they are very wellcome 
Check out this thread: http://www.zbrushcentral.com/zbc/showthread.php?t=23879
Also try using ZBC’s search feature. Look for threads with “alphas” in the subject line. You’ll find a lot of freebies.