Technology Star Fleet should have jumped on with both feet

I’m absolutely certain that by the time of TNG immortality is possible, but the Federation has supressed the technology for cultural reasons (“human dignity”, etc.) I can just picture a DS9 episode where Dr. Bashir discovers that a relatively simple medical treatment could make people perpetually young; only Section 31 pays him a visit and explains that it’ll never be allowed.

That’s why I said a “staff”.