Thank you, Tulsi for that information. I believe this must be the record setting plant that you had!

Normally in horticulture and agriculture, the life of plants is based on its useful life. The plant is considered 'expired' when - it loses it beauty, or it does not produce a good yeild (of leaves, fruits, flowers, or seeds etc. The plant is discarded and replaced then. For tulsi and most plants of the same genus (Ocimum - Lamiateae) I have got the longest life span as about 2 years. Thank you again for the update!