Hi bjadams67, and thank you for joining in this conversation. While we cannot provide medical advice or diagnostics over the internet (for your own safety), your comment certainly deserves a reply.
Your training when you were younger sounds more like an increase of strength, endurance and breathing capacity rather than an actual physical change to the structure of the lung. To be certain, you may want to run this past your personal physician for his/her opinion. Please do check back and let us know what you are able to determine, if you don't mind.
Wishing you well,
Leon (site moderator)