Never mind, Nikos. People drop out, don't they.
The same with bands. Original members drop out but then new ones join up.
Approximately 10--15% of USS Constitution is original to the warship’s 1794--1797 building period. Found below the waterline, the original material which has served “Old Ironsides” for over 225 years consists of the live oak vertical framing and the exterior white oak horizontal planking. (The interior, below-the-waterline planking was replaced many times over the warship’s long career, most recently in different twentieth century restorations.)
The “Ship of Theseus” conundrum.
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The founding members of Rush were guitarist Alex Lifeson (born Aleksandar Živojinović), drummer John Rutsey, and bassist Jeff Jones. The only surviving (last I checked) member of Badfinger is guitarist Joey M, who was brought in after the band was signed to Apple. The Eagles are now The Eagle, since only the drummer Don Henley remains of the founding members (Leadon’s alive, the other two dead).