I'm returning to the road after a 15'ish year hiatus. The Binachi that I am riding was purchased and fit for me back in 1996 or so (I hit age 65 this year, BTW). No fitting actions have been taken since then.
I'm having more hand numbness problems than I recall from the 90's. 40 minutes into a ride is where it occurs despite a reasonable attempts at changing hand positions. From the reading that I have done one thing to check out is a forward tilted saddle. When I put a level across my saddle (when on a level floor) I find that the nose of the saddle is slightly lower than the rear of the saddle. But from what I can tell my saddle is tilted back as far as it will go (it is 'conventional' with a one bolt design). 'Level' (as measured by a level set across the saddle) would require the nose to go 'up' maybe 1/8" to 3/16" (no more).
But what is 'level' exactly. And FWIW I feel comfortable on this bike (other than numb hands-right one is worse, BTW) with no particular 'butt problems' or penile nerve problems (which interestingly I did encounter back in the 90's on occasion).