Is it in the blood?
Well my dad was mad on bikes before i was born but sold them when my elder brother came along.
My dad died when i was 4 so no direct influence. When big brother got his first bike and all his mates were into bikes i just couldn't wait to get one as well.
It just seemed so exciting and after travelling everywhere by bus as i grew up, the sense of freedom was brilliant. Any excuse to ride anywhere.
My mum was horrified that both sons had bikes, especially as 2 close friends were killed in quick succession (both on the pillion of the same rider!!!!!!!!!!!)
Mum payed for car lessions, i passed car test then didn't drive a car for 5 years.
Bikes always have been, and still are a real passion. I would take summers off from despatching and ride to Greece for a holiday. I've also been incredibly lucky that i could make my living for the last 24 years from being involved with bikes and have never been without a bike for the last 28 years.
So yes i think it can be in the blood although for many more people it is a transient stage.
For me its a combination of the freedom to explore and travel,along with the exhilaration of speed and performance, combined with the camaraderie. Even if i don't get out on the bike, i'll always spend a few minutes in the garage each day, and come to the same inescapable conclusion...thank god its not yellow