Hi Dorian,
This tour is now fully booked with 25 travellers. Ages of the group range from mid-20s through to mid-70's - there's a really nice mix in the group.
The tour doesn't include the Sistine Chapel or Vatican Museum, however the guided tour of Rome ends in St Peter's Square. There is then some free time for you to explore - so an opportunity to visit them if you wish. If you speak to the Tour Manager when you arrive, they will be able to point you in the right direction.
Kindest regards,
Julia