Hello,
However, considering your age, it's important that we rules out 
ischemia as a cause of these. So you should be evaluated with echo, ECG, stress cardiac test, etc. These are increased by smoking, excessive alcohol intake, excessive thyroid hormone levels, caffeine etc. You should get a thyroid profile done to rule out 
hyperthyroidism. You all need echo and If not done, cardiac 
stress test like stress thallium or 
CT coronary angiography.
So overall, the likelihood of serious issues is less, but needs to be evaluated. The treatment for us this is beta blockers like 
Bisoprolol and if not helping them either the dose should be increased or calcium channel blockers or anti-arrhythmic drug may be added. So you should this prescribed.
Hope I have answered your query. Let me know if I can assist you further. 
Regards, 
Dr. Sagar Makode, Cardiologist