How old is the Bayezid Hamam in Istanbul?
The museum's official account dates construction to 1507–1508 using archival evidence. It is now a place to learn about bath culture, rather than book a wash.

Related questions
Can I bathe at the Bayezid Hamam Culture Museum?
It is a museum visit, not a treatment reservation. Check current visiting arrangements directly and book a working hamam separately if you want a bath.
What is the connection between a hamam and a vakıf?
A vakıf is a charitable endowment. Some Ottoman baths generated income for foundations supporting institutions such as religious, educational or social facilities.
How can I check whether a hamam's history is accurate?
Look for the building's own documented history, museum records and restoration research. Separate construction dates from later alterations and the current operator's marketing.