No mtn bike here, but I did get my first cyclocross bike (like a road bike but ridden off-road) at the age of 63. LOTS of fun.
Have fun.
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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.