I'm sure MayBee70 is right in saying that we don't lift our feet up the way we did when we were younger. After my series of falls last year, DSs told advised me to look where I was putting my feet. Touch wood, I've been OK so far this year. I am wary about walking on the pavement on this street as the surface is disgraceful and I fear for the numbers of older people like me who use it.
I've got another 'keen'... Ouch!