Last night I listened to a sermon preached by Rev. Angus Smith on 2 Corinthians 5:20-21. He was my Grandparents minister many years back, and is still preaching and bearing fruit in his 90's.
If you have some spare time, I would recommend the listen (Here).
I took the thread title the wrong way and was all prepared to say that I turned 50 with 1 under one and 1 on the way! Now I see that would not be relevant, so never mind...
On topic, I have always prayed that the Lord would let me serve Him actively in ministry until I have drawn my last breath.
(when my Internet signal is stronger, I will try to listen to the linked sermon)