While most movies nowadays use expensive CGI-technology to let actors appear younger, Saw 6 (2009) used the far superior method of Tobin Bell just wearing a baseball-cap backwards in the flashbacks :
Parallel Thinking and the Six Thinking Hats
Imperial White Habanero 6 Panel Rope Cap
The 6-Panel Wool Ivy Cap - Mike The Hatter
Men's Hats | Trucker, 5 and 6 Panel Hats - Katin USA
Lightweight Cap | On United States
Low Profile 6-Panel Cap 1111 - Pale Blue - Bulk-Caps Wholesale Headwear
Imperial White Habanero 6 Panel Rope Cap
Port & Company - Youth Six-Panel Twill Cap | Product | Port & Company
number 6 six Accessories Caps & Hats | Unique Designs | Spreadshirt