All dating apps target millennials... because they are developed by millennials. When will SV get for once that they don't get their demographic as they have nothing in common with people 40+. For example, except Microsoft, no other SV company gets families. I was surprised by the idiotic family support Google offers in their ecosystem and especially Google One. Same with Spotify, Netflix, etc. Facebook with their "family" support of children less than 13 is totally idiotic as well (scrapbooks or whatever they call it) - and so is their "dating" app! They just don't innovate these days - they just copy competitors in sick hopes to make people come back.
True about millennials and Gen Z, but "millennial" now acquired the meaning of "ungrounded young people". It depends on what you call a "market". Real dating apps charge fees and don't have hidden agendas like Facebook (rule the world and sell your data to advertisers) - that's what I call a "dating app market". Sifting thru photos is not really dating - especially Instagram and Facebook photos, which, in most cases, are twisted reality.
As a millennial a few years shy of hitting 30, I find your rounding up a bit too generous. That aside, Iād still say that the prime Tinder age group is millennials.