I was told that i have moderate concentric left ventricular hypertrophy 65%-70%, how worried should i be?

If this measurement was taken from an EKG it is rather specific, but an echocardiogram is more accurate. Some pathology like hypertension or aortic valve damage is exerting strain.LVH is serious&as it worsens heart function weakens in time leading to eventual congestive heart failure. Consult a cardiologist to determine its cause,prescribe appropriate treatment& provide long-term follow up.care.

The cause of the LVH needs to be determined. The most common cause would be blood pressure greater than 120/80 untreated. Discuss with your team.