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 :
Men's Snapbacks, Hats, Beanies & Visors - New Balance
Just Launched: New Era #NBAFitted Hats - Lids
The 6-Panel Wool Ivy Cap - Mike The Hatter
Low Profile 6 Panel Dad Cap | Beechfield Original Headwear
6 Panel Hat, Black Nylon Hat Cap, 6 Panel Cap, Six Panel Hat, Men's Black Hat, Women's Black Hat, Unisex 6 Panel Hats, Hats for Men & Women - Etsy
1111 Davie Six Panel Cap | Caps / Hats | AS Colour
Classic 6 Panel Cap Navy – Trendsplant
Types of Baseball Hats: The Top 5
Imperial White Habanero 6 Panel Rope Cap
Classic 6 Panel Cap - Baseball cap | Cape Town Clothing
Men's Hats: Trucker Hats, Sun Hats & Beanies by Patagonia