It's pretty funny to have Kenta still be in school. Like the highlight of his life was in high school, so he decided to spend the rest of his life there or something. It wouldn't have been too bad, but I think all of us are wondering what happened to his hair.
For fun, I looked up what the past MegaRangers were doing
MegaRed, Ooshiba Hayato is still acting. He's cameoed in Hurricaneger and Den-O, and of course, Gokaiger
MegaBlack really didn't continue acting beyond MegaRangers
MegaPink Higashiyama Mami looks like she's still acting too. I'm sure her best cameo was Takaoka's mom in Boukenger
I don't recognize most stuff that MegaSilver has been in. But he was Tatsuya's dad in Rescue Fire 37:
Matsukaze Masaya or MegaBlue is probably the best known now. He became a voice actor and was the voice of Mikami Teru in Death Note. He was the voice of Kaoru's dad in Shinkenger. Spoilers:
Spoiler
Tanaka Eri or MegaYellow hasn't been in much recently either. But she was a cop in Kuuga and Natsuki's mom in Boukenger