Another one here who doesn't understand the term change a bike.
11 and counting, built up over the decades, with two additions this year, both c30 year old Italian Steel framed roadbikes, one bought, one given to me. My most used bikes are the two I commute on, one is 35 year old Peugeot roadbike (Summer) and one a relatively new (6 year old) Fixed (Winter).
However, I did, for the first time in my adult life (and I'm 55) gift a bike this year ........... to a mate's young son who has been through a very rough last four years with the break up of his parents, with Dad getting custody. He is a keen skateboarder and surfer (9 years old but very tall, more like your average 13 year old) and loves his MTB. I reckon with saddle and handlebar right down, give him two years and he'll be out riding with his Dad and me. Here's to the next generation of us cycling nuts!