What's your point? If you had kids you had a family and it is up to you to make it work. Just because your kids have left home it doesn't mean that they are no longer your responsibility, they are your legacy and it is your duty as their parent to help them succeed. Kids are your responsibility for life, your responsibility doesn't end simply because they grew up, your children will inherit your wealth and if you raised them well will give you grandchildren. Divorcing after the kids leave home means losing influence over your grandchildren.
At the point you can't have kids and don't have them but are with someone you love and in a healthy relationship you could choose to adopt orphan kids and ensure that lost and forgotten children don't grow up unloved and become criminals. A childless family can still have value through adoption.
If you lose kids and don't want more then your marriage doesn't have a function so it is irrelevant.
If you are gay you shouldn't have kids regardless so there is no possibility a gay marriage would have value.
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