I married a man that was 21 years younger than me. Because of extenuating circumstances the marriage is ending. Not because we don't care for or love each other...but it's a long story that I won't go into.
My kids had some difficulties (and they were in their 20's when I remarried) but they soon got over them. When children see their mom happy, they tend to step on the bandwagon. Being open to discussion and giving them a chance to voice their concerns and feel validated is important. I would insist on everyone being respectful within their discussions. You can validate their feelings and still marry the man you love and be happy too. While most family and friends want what is best for us and may not always agree with our decisions, as long as their is not abuse in the relationship, then take their opinions with a grain of salt, validate them by accepting how they feel while standing your ground and going for what you both want. Sure beats worrying what folks will say and having issues with them as well. At some point, they will get over it. As long as they see the happiness between the two of you...they will back off
Wishing you well!

sabby