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Well nobody knows for sure. The problem is - how can you prove it won’t decay? If you watch electrons for a long time you can prove that the lifetime has to be very long. An experiment in 2015 showed that the lifetime of an electron, if it does decay, must be at least 6.6×1028 years.
See: Electron "Lifespan" is at Least 5 Quintillion Times the Age of the Universe. If we write it out in full, at least 66 thousand trillion trillion years, or at least 66,000,000,000,000,000,000,000,000,000 years.