Why would a 30 year old millenial guy get offended and upset over a woman his age dating a smart mature guy in his 40s?

My fiance and I have about a 16 year age gap. Now that I am preparing our wedding a lot of guys my own age have got angry and upset over the fact that I am enaged to a smart , sweet intelligent men in his 40s. I don't understand , Why? I've seen with some of my other friends who happen to be married to mature guys in their 40s guys my agebstart to get angry about it and complain. Are 30 year old guys jelous at a men in his 40s for having everything together?

Why would a 30 year old millenial guy get offended and upset over a woman his age dating a smart mature guy in his 40s?
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