How old is SushiSwap?

I'm curious to know, how long has SushiSwap been in operation? As a decentralized exchange platform, I'm interested in understanding its history and the amount of time it's been providing services to the cryptocurrency community. It's always important to consider the longevity of a project when evaluating its credibility and stability in the fast-paced world of finance and technology. So, can you give me a brief overview of SushiSwap's age and any significant milestones it's achieved since its inception?