Eh, doesn't matter much to me whether it be for young or older people. I Just read whatever grabs my interest to be honest. It's pretty much always been this way for me.

I wholeheartedly agree.
Granted, some stuff for older people isn't able to be properly (or at all) appreciated by the young (depends on the "old stuff" and how young the "young" is ...and the individual, to some extent)
...and/or be very much inappropriate for them.
Aside from that, however...

I see the target age/sex/whatever, as the audience that is most likely to appreciate it.
I do not, for the life of me, understand the people who see it as an indication, that no one outside of that, can/should appreciate it.
People who say things like "you can't watch/read/play that! It's for girls!" (or who would treat girls who like "male" stuff, as being unfeminine ...or a lesbian, to add a little homophobia to it) or conclude that something can't be any good, because it's made for kids (and tell you to grow up, if you like it).
Good stuff is good.
Bad stuff is bad.
Period.

I have MUCH less tolerance for manga aimed totally at young people than I did ten years ago.

When I got into manga back then, I was just about old enough to retire, and there was a TON of free manga out there. In among all that, I found those few manga that deal with issues that face everyone of any age, like "Ai Ren" (love and death), and many manga that are apparently about the concerns of young people but are really just as interesting to peope of any generation, like "Strawberry 100%" (what will I do with my life, and who shall I do it with?).

In other words, without knowing it, I was picking those few manga that really could appeal to a very wide age group from among decades of translated shonen.

But now I think I've really found them all. And all the new stuff seems to be endless variations on themes of simple escape (hero transported to another world), or sexy materials which scanlators chicken out of translating halfway through.

Time to move on.

"Old person yells at cloud"

About what I expected.

Stayed about the same. I got into manga with seinen and branched out to shoujo and josei. I've never been a huge shounen fan but there are some I like.

I prefer more mature romance now so I read less shoujo, but my favorite genre is fantasy so I still read plenty of shounen. I put stayed the same because I'm still not very picky, but I have less time so I'm more selective.

mature stuff is probably better now
I won't be reading 28 chapters of rurouni kenshin no more; even if there are invariably worse ways to spend a few days
sometimes the difference in reader maturity can vary even when it's the exact same reader
storylines involving family & children hit me way harder now than they did when I read them the first go around


I like female POV stories now because I get surprised much more often, my guesses aren't nearly as accurate