I'm 66 and still have a level saddle and at the same height.
I did change to a Spesh Power saddle nearly 2 years ago and much prefer the shorter nose. The cutout works very well and the width of the back is near perfect.
I've slowed down a bit since I was a senior 3, in the uscf days, but I can still drop fit people 30 years younger on climbs...did it Sunday on our 50 miler...it felt great.
If your not comfortable makes changes that restore comfort...along with the comfort comes a degree of better performance and efficiency because your body and mind are not trying to find a comfortable position.
Ride On to all us old mf'ers...