I am recently new to it and its for life for my sub.
Edit : I must have gotten lucky (for once) and just got the lifetime sub, I see it is 1 year now.
Your products
Qty. Product name Delivery
1 Malwarebytes Anti-Malware Pro
Lifetime License, 1 License/PC Download
No doubt it changed when 2.0 arrived, I bought when it was in beta so was 1.X