I've seen some reports that tortoises denied hibernation suffer from eating problems, etc. Others report that they've kept their torts awake year-round for many years with no problems.
I've hibernated my russian torts for about 4 years now, but mostly because I wanted to breed them (they did) and I don't have much indoor space and it was easier to just let them sleep through the winter.
I don't hibernate them during the first year of life, and I don't hibernate them for more than 100 days. I found that my group went to sleep when temps dropped below 60, didn't need temps lower than the 50s, and still produced eggs.
I think if you get captive-bred hatchlings, they'll probably stay awake and active for you year round. If you get wild-caught animals, then they might want to slow down in the winter, even if you keep them warm and well-illuminated.
So, you can try keeping them up in the winter if you want, and be prepared to let them sleep if they want. Just turn off the lights for a few weeks and let them snooze.