Don't like it. Wouldn't do it.
Also, I can't help but wonder, why is the older person interested in someone younger? The larger the age gap or the younger the young partner, the more likely to me it seems to me that the older partner is not emotionally mature enough to have a functional relationship with people their own age. To me, that's a red flag, but I suppose that depends on your relationship values and is moot in hookups. Granted, it could also be that the younger partner is too mature for their own age group, which seems less likely to me but also seems to be cited as the most common reason, from my observations.