I don't know if it's just me, the background image of the app just gave me a paedophile-ish vibe
Socially, though, yes. The generally accepted limit on age differential in romantic relationships is ten years - 50 year olds shouldn't date younger than 40, 40 than 30, etc. While it's perfectly legal and possible to have a healthy relationship with a wider age gap, it's not socially acceptable.
I attribute a lot of that to the increasing youth-orientation of modern culture, since "May-September" relationships have been common throughout history, although legitimate concerns about abusive power dynamics and exploitation do sometimes arise in the modern context.
We should not tolerate bigotry or label consensual adult relationships "generally accepted" or "not socially acceptable". That's the kind of nonsense we need to leave in the past where it belongs.