I have to disagree with you about the character editor being good in mv. I spent hours trying to make four guys for my party that did not look unisex..... And as far as making someone look older than a teenager.... Forget it. In ace you had options like being bald, wearing eye patches and numerous other things to use. Also, hitting the random button "actually produced" characters that looked different ages and with different overall looks. In this one in mv... You could hit the random button 50 times and see some face 10 or 20 times with nothing "really" different except their hair. Speaking of hair.... I'm sorry but coming up with a hair combination that doesn't look unisex is painstakingly hard to do. The minor bugs are not that big of a deal to fix, but they seriously need to rebuild that character editor from the ground up. I would gladly pay money for a plugin that fixed that editor..... And even more for one that replaced it all together.
The Character Generator in MV is fine the way it is as it actually has the capacity to color the sprites. VX Ace's Generator did not have that ability and all the colors were baked into the parts. Now where MV's is a little underwhelming is that it could have came with more base parts, but ask your self how much extra work this requires on the part of the developers. The "age" you're talking about is because ACE had 8 base face shapes for males and 13 for females where as MV has 3, in which there was one "older sunken looking" face (Face08.png for male, Face13.png for female).
Let's take a quick look (M/F):
Faces: Ace 8/13 MV 3/3 (only 4 colors possible in Ace)
Eyes: Ace 10/11 MV 14/13 (only 8 colors possible in Ace)
Eyebrows: Ace 9 (Unisex) MV 11/10
Ears: Ace 3 (Unisex) MV 2/2 (Not including Animal ears)
Front Hair: Ace 16/16 MV 16/15 (only 8 colors possible in Ace)
Rear Hair: Ace 16/16 MV 17/19 (only 8 colors possible in Ace) (MV has separate left/right parts.)
Mouth: 8/10 MV 10/10
Nose: 10/11 MV 10/10
Beard: 3/0 MV 5/0
Clothing/Accessories
Glasses: Ace 6 MV 4/3 (Unisex, 8 colors only for Ace)
Animal Ears: Ace 5 MV 1/1 (Unisex, 8 colors only for Ace)
Facial mark/Tattoo: Ace 5 MV 3/2 (Unisex, 8 colors only for Ace)
Accessory 1: Ace 5, MV 6/5 (3 separate colors available for MV for each part, only 8 single colors for Ace, unisex for Ace)
Accessory 2: Ace 10, MV 5/7 (4 separate colors available for MV for each part, only 8 single colors for Ace, unisex for Ace)
Clothing: Ace 16/16 MV 18/19
Not to mention that each part has 16 or 24 colors that it can be switched to in MV where as Ace could only ever use the 8 baked in colors for the parts. Add in all the Side-View assets and MV's generator is far more flexible than Ace's.
Now... what I don't really like about the generator is that the "beast ears" don't look right on any head due no ability to hide the human ears, and the "cat/dog" type ears look like a headband behind the hair fringe in the portrait while the sprites has them all over the place. That's really my bone to pick with how it generates portraits.
A better nitpick is what came stock for outfits. Seriously? Every SF_Actor outfit is the same? There's 3 unique outfits reused for all 7, compared to the 11 fantasy outfits which are all unique. The female version is even worse, the only difference between any of the outfits is the "tights/socks" in the sprites vs the males where their shirts changed but their pants didn't. Like what?
Like maybe the SF_Actor sprites are meant to be a school, and that would fit maybe, but it seems more like a shortcut to me. (Yes tiny differences do exist, but the point was that in the character generator, those differences are barely anything.)
One could completely come up with a new generator set if they replace all the artwork. Is it worth it? No, not really. If you don't like the "3/4" faces, then you're just going to have to pay someone to make something else. The developers included enough sprite pieces in MV that you can create 22,230,000 unique characters of one gender before you include colors, clothing and accessories.