Am dating man 20 years older than me
Me personally I feel that if the man treats you right and loves you for you there is nothing wrong. He is the same age as my mom and dad and I the same age as his older daughter.
We love eachother dearly and both share and want the same goals in life.
I'm not trying to be snarky or mean, but every single thing above are the increased risks you incur when you are much younger than the man you marry.
He's been married twice before with 4 kids(2)from each marriages and the youngest being 16 months.
Its hard at times because we were raised in two different times but we make it work. To be honest I can't even fathom what my life would be like without him.
It all comes down to the fact that...you truely love somebody, age is just a number, but your heart is everything.
If you don't mind the almost certainty of having little or no sex (at least not with him)for the last third/half of your marriage while you're at your sexual prime, go for it.
If you don't mind seeing him through terrible, debilitating illness, go for it.