I commend you for thinking of taking your parents for Hajj.
It is not only permissible to do so; rather, it is also a most meritorious deed, whereby you would reap manifold blessings. No act of kindness towards our parents - big or small - should be taken lightly.
So, I would urge you to go ahead and give your parents the best gift you can ever give them.
I pray to Allah to help you fulfil your cherished dream.