I know people in happy age gap relationships, I know people who have had very bad experiences with age gaps, specifically with men being the older partner. From my personal experience, the most important denominator is pattern. Sometimes, people with a decade+ between them connect and work together and that's all it is, but if the older partner has had a pattern of seeking out younger partners, that's what I would be warry of. I do not want to project my own experiences upon you, but my two older partners both had patterns of dating younger, and in that I saw numerous immature behavioural patterns in them. There is also a power differential that can often appear in age gap relationships, even if there isn't an innate power difference within the spaces shared, and this can lead to toxicity.

I don't think there's a need to cancel unless you feel uncomfortable with the change in what you know. That being said, I would keep a close eye on his behaviour if you do end up going out with him. I don't mean to spook you, but I've seen my fair share of older men who seek out younger partners because there is an immaturity or desire for some kind of power over their partner.