Bridges and chains

The hard climbing road started from Northern peak of Mt. Kashimayari-gatake. There were many chains, bridges and stairs. There were many place that I would be die if I missed moving my hands and legs.
I afraid and avoid such a rute, basically. But, after I through such course, I always be full satisfy. I may love such a dangerous climbing road.
I'd through such a coarse alone after 5 years interval in Mt. Hodaka. I'd through with my friend after 4 years in Mt. Tsurugi. All of them were hardest in my climbing life. I thought I should climb such mountains during I'm still young.
Until when, can I will climb such a hard road ? At the time my legs don't move well, my life will be end.