Sorry to hear about your back.
I'm 73 and was diagnosed with spinal stenosis about 3 years ago. My spine doc (who is a cyclist) told me to continue riding my drop bar road bikes. They're great for stretching out my lower back.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.