I have a degenerative heart valve and had valvuloplasty in early 2001, how much longer will the valve last?

Variable: If you are 30 now, your valve was ballooned when you were ~19. The valve location was not specified- most common would be either the pulmonic valve due to pulmonic stenosis or the mitral valve from mitral stenosis. You need to have this reevaluated on a periodic basis with an echocardiogram. It may be several more years before the valve restenoses, then may need re-plasty or valve replacement.