Dating younger / older

Now myself dating a younger woman (25 years)

any opinions about people dating with an age difference greater then 20 years?

and now answer the same question again if it was your mum or dad?

and for which reasons you approve or not?
is it cultural convictions, religious convictions, personal convictions?
Do you think society is more or less hypocritical about it and just plain jealous?

i would love to hear your opinion