1. Does this PhD program encourage (not just allow, but encourage) part time study for working students? Trying to learn and succeed in a PhD program for traditional age (20 something) full time students, when you are a 30 or 40 something working professional is a recipe for failure.
I think zharkov actually raises two separate issues here, even if that wasn't his intention.
The question about part time is an important one. My doctoral program initially did not allow part time study. Starting with my cohort, they softened on this issue for a few years--and every single part-time doctoral student ended up not completing the program. So, they went back to full-time only until they were able to design an alternate-track program specifically for part timers. Because it's still so new, the jury is still out on whether the program will succeed.
The other issue zharkov raises here has to do with age. I'm going to suggest that age isn't really an issue, except in fields where real-world experience is a plus, giving older students an advantage. But the full-time versus part-time issue is, again, a big deal. The part timers who dropped out of my program simply didn't have the time to keep up the pace, and they also missed important opportunities because they just weren't around enough to take advantage of them.
I'm not sure what the best decision for you is, but I do wish you good luck, either way.