Not all people with chicken pox will have shingles in the future. But certainly some will.
For some, chickenpox will return later as shingles
"People in their 60s run a 30 percent chance of having shingles, particularly people with cancer who have their immune systems weakened by treatment, …"
http://www.reporternews.com/news/2013/jan/22/for-some-chickenpox-will-return-later-as/
Yes, the older you get, the higher chance the chicken pox virus will hurt you again.
