35 and going back to university

[the8thHorcrux]

Am I crazy to think going back to uni now? I will be 40 by the time I finish the whole program. we will have to make lots of sacrifices to achieve this, but will it be worth it?

What are you going to study? Of course you're not too old. Whether it is worth it depends what career you're aiming for... but you'll still be 27 years from retirement when you graduate, so if it will lead to the job you want and better prospects. Yes, it is worth it. Good luck OP.