Having trouble with my legs. can't stand long, legs go numb. climbing stairs a problem.?

Could be stenosis: When standing, spinal stenosis in the lumbar spine usually becomes more symptomatic. In other words, the pain or numbness in the legs gets worse. I recommend evaluation by your doctor who could order tests such as x-rays, MRI or a ct scan of your low back and check for other possible causes of your complaints.

Claudication: This word means leg symptoms with walking or standing that can include what you describe as well as tingling, weakness & pain that can be due to a spine issue like spinal stenosis (spine canal narrowing) or to peripheral vascular disease. (poor circulation). If just standing brings it on, then it is more likely the spine as the source. You need further evaluation and can start with your doctor.