I'm just like you grandtanteJE65, however my problem is getting on my bike, rather than getting off!
Each morning I walk my dog for a couple of miles, but occasionally need to use my bike.
I have difficulty getting my let over the low crossbar, and gaining enough speed to balance. The other week, I failed to gain the speed, and landed heavily on the pavement! Luckily, a lovely girl helped me to get up again!
It is a problem. We live in the countryside with long lanes to get anywhere. My bike gives me independence, and I don't want to give it up!