19 and 30 there is big difference
If my daughter or daughters want marry someone who is 20 older then her or them or some guy or guy tht are same age me I would refuse and advise tht isn't good for her or them since those want someone tht is t same lvl as them like wan in their age and it would shame to me my daughter or daughters marrying some tht is same age as me lol
Ideally, a man should be older always than his wife. We age differently. 10 to 15 year gap in age between a couple is not noticeable.