I used to be totally against dating a younger guy, but now that everyone's a bit more mature in my age group the idea isnt as unsettling as it once was.
I still think that more than say...15 years difference is kind of iffy, but who am I to judge? If it's legal and the people are happy, then let love do its thing.
I think so long as both people are happy, glet them be happy. On a BDSM site I visit, I saw a slave aged 22 with a master aged 53. Their living together happily and hes looking for another slave to live in the household with them.