Grumpy Old Geeks People Tiffani Amber Thiessen Person Tiffani Amber Thiessen 2 mentions in 1 episode An actor mentioned during a discussion of celebrities the hosts grew up watching. Mentions 140: Rapid Unscheduled Disassembly Dec 18, 2015 3:36 You're Tiffany Amber Thiessen's and that such. 4:24 Tiffany Thiessen is 41 years old.