What is the meaning of the phrase 'Youth is nimble and age is lame'?

That the young can move quickly and that the elderly move slowly and sometimes with assistance is the meaning of the phrase "Youth is nimble, and age is lame".

Specifically, the Word "nimble" means "fast, smoothly, without difficulty or inconvenience". The young tend to have no problems picking up their feet and moving them quickly and flowingly in other directions and to other places. In contrast, the elderly will limp, require walkers or walking sticks, or stumble when they have problems placing weight on their feet or putting them where they should go.