41 years old - Is it sensible to get an arm lift and thigh lift at the same time?

Combining procedures is common and considered safe, but there is a limit. The procedures that you are considering could potentially be done in one trip to the operating room, but an examination and review of your medical history is needed to determine if you are a good candidate. The best place to begin is a consultation with a board certified plastic surgeon near you.

You must have in mind that you won’t be able to use your arms to support your body to move around because of the arm lift.
After the thigh lift you won’t be able to use your thighs to move around and specifically Thighs are very challenging To recover.
So if you do both at the same time the recovery turns into a very rough, tough and painful recovery, because you must use something.
My recommendation will be to have surgery in the same anatomical area. Breast and arms sounds like a perfect plan.
Dr. Cárdenas

It is possible to do multiple procedures, including arm and thigh lift, breast augmentation, eventually breast lift, in the same time. However, only on the basis of in person evaluation, a board certified plastic surgeon, familiar with these procedure and aware of patient medical condition, could make a sound plan of how many and which of these procedures can be done in one surgery, safely. Good luck.