Probably around 3-4 years of age in the much revered Austin J-40.
I'd just like to point out that it was not new when I had it as a boy, but not far off....
Wish I still had it.
sh*t, this brings back memories.
Did your's have working headlights? mine didn't but the lad nextdoor had. And he had inflated tyres as well. But mine was quicker and used to drift around corners if you kept peddaling really hard and leaning into the bend.
sh*t, really great days of the 50's, where kids learnt not to fall out of trees by falling out of them!