Biggest Age Difference You've Had With Sexual Partner

What is the biggest age difference you've had with a sexual partner?

I'm friends with this woman who is old enough to be my mom and she's been kind of relentless trying to get me to have sex with her, which I've been kind of hesitant to go through with. I've let her give me a bj a couple of times but I really wasn't interested in more than that but I'm kind of considering it.