I'm 60 years old in a few months.
If you are a youngster,as I once was,you dont think about the last 5 steps

If I live to be 80,I'm 3/4 the way there.

Hmmm.
20 steps on the tank.
If my life ends at groundlevel I am now 15 steps down from the top.
Now there is some perspective! Unfortunately the farther you go down,the faster it goes.
Well I'm on my last five steps,and I wouldn't go back,seems every year gets a little better.
BUT
If you are still in your first half,and everything seems slow be patient,remember the stairs,
enjoy a slow walk down,it will go fast enough,you wil soon be on your final 5 steps