What's Good About Old Age?

The Bible is written to and for people of all ages.  It's principles, warnings and promises are for the present as well as future generations.
I'm reading Judges right now and came across a phrase in Judges 8:32 that stimulated my thinking.  It says, "Gideon son of Joash died at a good old age. . ."  Now, at first glance we could say that 'old' means he lived a long life.  But what about 'good'?  Is there anything good about being old?  I remember a popular phrase from the 1960's: "Don't trust anyone over 30".   Hidden meaning: if someone was over 30 they were old, out of touch, didn't understand the current generation and couldn't be trusted.
Getting old does have its challenges and disadvantages; no argument there.  But the Bible shows us that 'good' and 'old age' can go together in the same thought.  A little quick research revealed that this phrase is found in the Bible  in reference to only three people;  Abraham, Gideon and David.  They all "died at a good old age."
If one can die at a good old age then it must follow that it is possible for one to die at a bad old age.  Here's what I think about that as I reflect on the lives of Abraham, Gideon and David.  These men didn't get it right all the time but they trusted God and lived their lives as godly individuals.  Yes, so did many others in the Bible but there must have been something about the overall choices these three made along the way that singled them out as the ones who died at a good old age.
Here's a question that applies no matter your age.  What choices are we making in our life journey?    Are we making choices regarding physical, mental and spiritual well being that will let us finish among those who die at a good old age?
If I can learn anything from Abraham, Gideon and David I learn that a heart fully devoted to God is the key to finishing well; dying at a GOOD old age.