You Don't Know This?! (2026) featured a cast of 7 tracked actors. Of these, 6 (100%) are still alive today. The oldest surviving cast member is Jochem van Gelder, age 63. This TV series starred Art Rooijakkers and Arjan Postma.
100% still with us· verified cast86% of full cast · incl. 1 unverified
Survivorship
Cast Reunion Index: 100% still living
Cast7 members
| Person | Character | Status | DOB | Age | DOD | Age in 2026 |
|---|---|---|---|---|---|---|
 Art Rooijakkers Self - Presenter | Self - Presenter | Living | 29/08/1976 | 50 | — | 50 |
 Arjan Postma Self - Guest | Self - Guest | Unverified | — | — | — | — |
 Lisa Loeb Self - Guest | Self - Guest | Living | 31/05/1989 | 37 | — | 37 |
 Jochem van Gelder Self - Guest | Self - Guest | Living | 23/05/1963 | 63 | — | 63 |
 Raymond Mens Self - Guest | Self - Guest | Living | 25/12/1986 | 39 | — | 40 |
 Tess Wester Self - Guest | Self - Guest | Living | 19/05/1993 | 33 | — | 33 |
 Raymond van de Klundert Self - Guest | Self - Guest | Living | 17/04/1964 | 62 | — | 62 |