Depends on who and what you're following, I guess. Being a male in my mid- to late-30s I don't use Instagram for social purposes, as I don't have any personal photo of mine in there, I'm just using it to post architecture-related photos (mostly photos of communist brutalist buildings built in my city in the 1960s and 1970s) and to follow people interested in very similar things. For purposes like this one is quite an interesting medium.