Base 2001 Honda Prelude Rpm Issue?

So when I'm driving around (manual transmission btw) @ 60 mph in 5th gear. My rpms are around 4500 then when I hit 70 mph I get 5000 rpm. I know preludes are notorious for having transmission problems. I just don't know what to do to lower the rpms cause it seems high. Would changing the transmission fluid relieve? I don't know. What do you think?

Sounds right to me. If you go faster the RPM goes up.