Jay Leno is still grateful despite several health woes plaguing him and his wife, Mavis, in recent years. In an interview published Wednesday, October 16, the former Tonight Show host, 74, appeared to have an optimistic outlook on life amid his spouse’s ongoing battle with advanced dementia and after the famed comedian faced a series of intense injuries himself during a 2022 fire in his garage. “It’s OK. You know, it’s life. Everybody goes through it,” Jay admitted when asked about Mavis’ current condition. “I’ve been very lucky in my life. I don’t complain about everything. We have a lot of f…