one of the research paper told me, you can harvest in 5-7years old

Lobsters can be harvested once they reach a certain size (or market preference), which is typically regulated by law to ensure the sustainability of the population. While their exact age is difficult to determine because they shed their shells as they grow, it's generally estimated that it takes a lobster 5 to 7 years to reach the minimum legal size for harvesting. At this point, a lobster usually weighs around one pound